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Thread: Computer switches off and on after a few seconds

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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
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    Thumbs down Computer switches off and on after a few seconds

    Hi folks,

    Apologies for me possibly asknig the obvious here, but I think its best before going out and purchasing more good to kits my machine out.

    I have just assembled a new piece of kit, which when I boot up switches off after about 4 seconds and then back on after 3 or 4 seconds. With no clear activity on my monitor. Occationally I do get activity on the monitor and goes into my install windows process, however usually hangs in process.

    I am sure its my PSU as I only have a 425W. But I would like to get some ideas incase anything else might be causing the problems (specs listed below).

    Abit IP 35 Mobo
    Intel Core 2 Duo E6750
    nVidia 8800GTX
    4GB GeiL DDR2 800mhz
    1 500GB Sata plugged in (2 not)
    1 Sony 8x DVD Burner

    Can someone tell me its my PSU or make any suggestions? Seems like a no brainer 420W is not enough, but just wanted to confirm thats what is causing the issues.

    Thanx in advance folks

    UPDATE: I have tried the 425W PSU in my older machine with the 8800GTX and works fine. Old sys specs

    AMD Athlon64 3500+
    2GB DDR 400
    500GB SATAII HDD
    8800GTX

    Does the Intel CPU + Abit board seep that much more power than the AMD here? (excuse my ignorance if thats a stupid thing to say!)

    Please help

  2. #2
    finding nemo staffsMike's Avatar
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      • Motherboard:
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      • CPU:
      • e6600
      • Memory:
      • geil ultra pc6400
      • Storage:
      • WD 320gb
      • Graphics card(s):
      • leadtek 8800 GTS 640mb
      • PSU:
      • ocz gameXstream 700w
      • Case:
      • akasa eclipse
      • Monitor(s):
      • dell 2007wfp and Lg L194WT
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    Re: Computer switches off and on after a few seconds

    Have you tried running one stick of RAM? It might be struggling with 4GB if you havn't changed the voltages in the bios. 2.1 - 2.2v is needed for the geil ultra if thats what you are running.

  3. #3
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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    Thanx for the speedy reply, I have tried with 1 stick of ram (running at single channel) to no avail, same issues apply. Have tried voltage at both 2.1v and 2.2.

  4. #4
    Senior Member Colossous's Avatar
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      • PSU:
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      • Operating System:
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      • Dell 27"

    Re: Computer switches off and on after a few seconds

    As Staffsmike says - you could also try just one stick of ram, Graphics and mobo/cpu to see if it will post to bios if that fails. Sometimes your pc will turn off due to overheating (thermal throttling) but it appears to be turning off a little quickly for that maybe ?
    Hark the children of the Resolution !!

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  5. #5
    finding nemo staffsMike's Avatar
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    • staffsMike's system
      • Motherboard:
      • evga 680i
      • CPU:
      • e6600
      • Memory:
      • geil ultra pc6400
      • Storage:
      • WD 320gb
      • Graphics card(s):
      • leadtek 8800 GTS 640mb
      • PSU:
      • ocz gameXstream 700w
      • Case:
      • akasa eclipse
      • Monitor(s):
      • dell 2007wfp and Lg L194WT
      • Internet:
      • pipex homecall

    Re: Computer switches off and on after a few seconds

    I guess it could be the PSU.. it is a bit risky running it on a 425w PSU.

    Colossous point about heat might be worth checking. If you can get in the bios check the cpu temps.

    I thought at first you were just reporting the old P35 double boot but they function normally when they come back to life..

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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    Its wierd, sometimes it will post to bios, mobo does the usual "I'm on and happy" beep and go through the post process, however say 4/5 times it will just run for a few seconds, power down for a few seconds, rinse and repeat!

    It might be worth adding that when I got to a point of being able to install windows, after completing the format, blue screen of death appeared, causing me to reboot.

    On the times it has been in bios I have left it running for a while to monitor temps on the mobo and cpu, they appear normal.

    Another Note, might be that I have the 24 pin connector in ok, but the mobo has a further 8 pin slot, of which I am only have a 4 Pin connector on my PSU.

  7. #7
    finding nemo staffsMike's Avatar
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    • staffsMike's system
      • Motherboard:
      • evga 680i
      • CPU:
      • e6600
      • Memory:
      • geil ultra pc6400
      • Storage:
      • WD 320gb
      • Graphics card(s):
      • leadtek 8800 GTS 640mb
      • PSU:
      • ocz gameXstream 700w
      • Case:
      • akasa eclipse
      • Monitor(s):
      • dell 2007wfp and Lg L194WT
      • Internet:
      • pipex homecall

    Re: Computer switches off and on after a few seconds

    That would do it .. lol

    I keep forgetting to ask that.

    I think you can get a molex to 4pin connector I shall have a look.
    EDIT: found one here Molex 4 Pin Square Connector - Aria Technology


    If you need a cheap(ish) PSU the Corsair VX 450W is very good.

    520w HX model is even better and modular

  8. #8
    Senior Member Colossous's Avatar
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      • Motherboard:
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      • CPU:
      • 2500k
      • Memory:
      • 2x4gb Corsair Vengence Black 1600mhz
      • Storage:
      • Corsair 90gb sata3 ssd + Western Dig black sata 3 1tb Storage
      • Graphics card(s):
      • Gigabyte Soc Gtx570
      • PSU:
      • Nzxt Hale 850 watt
      • Case:
      • Custom Lian Li V1000
      • Operating System:
      • W7 Ultimate
      • Monitor(s):
      • Dell 27"

    Re: Computer switches off and on after a few seconds

    The next thing i would check would be the Psu then, do you have a spare or know someone who could loan you one for a test ?
    Hark the children of the Resolution !!

    http://trust.hexus.net/user_profile.php?user=7798

  9. #9
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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    I dont have a spare, however will buy a 600W PSU and give it a go as to be honest could do with more meat than 425W to deal with the my new machine.

  10. #10
    Senior Member Colossous's Avatar
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      • Motherboard:
      • Gigabyte Ud4 Z68
      • CPU:
      • 2500k
      • Memory:
      • 2x4gb Corsair Vengence Black 1600mhz
      • Storage:
      • Corsair 90gb sata3 ssd + Western Dig black sata 3 1tb Storage
      • Graphics card(s):
      • Gigabyte Soc Gtx570
      • PSU:
      • Nzxt Hale 850 watt
      • Case:
      • Custom Lian Li V1000
      • Operating System:
      • W7 Ultimate
      • Monitor(s):
      • Dell 27"

    Re: Computer switches off and on after a few seconds

    Quote Originally Posted by GavinW View Post
    I dont have a spare, however will buy a 600W PSU and give it a go as to be honest could do with more meat than 425W to deal with the my new machine.
    Cool, again - Staffsmike suggested Corsair and they are great Psu's - Seasonic and Enermax too - good brand models ftw, too many components get ruined by cheap and nasty Psu's !!
    Hark the children of the Resolution !!

    http://trust.hexus.net/user_profile.php?user=7798

  11. #11
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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    Thanx for the help guys, will try a molex 4pin square connector as suggested my staffsmike (thanx a lot for that) and if that works, I will invest in a better PSU.

    I will update on how it goes (fingers crossed!)

  12. #12
    Banhammer in peace PeterB kalniel's Avatar
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      • Operating System:
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      • O2 8mbps

    Re: Computer switches off and on after a few seconds

    Quote Originally Posted by GavinW View Post
    Another Note, might be that I have the 24 pin connector in ok, but the mobo has a further 8 pin slot, of which I am only have a 4 Pin connector on my PSU.
    Quote Originally Posted by staffsMike View Post
    That would do it .. lol
    Surely you just plug the 4 pin connector into the first four pins on the 8 pin slot? Using all 8 pins is usually optional unless it's a server board with two CPU sockets.

  13. #13
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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    I do have a 4 pin plugged into the first 4 pins on the board.

    If this isn't the issue then, what would be causing these symptoms?

  14. #14
    Banhammer in peace PeterB kalniel's Avatar
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    • kalniel's system
      • Motherboard:
      • Gigabyte X58A UD3R rev 2
      • CPU:
      • Intel Xeon X5680
      • Memory:
      • 12gb DDR3 2000
      • Graphics card(s):
      • nVidia GTX 1060 6GB
      • PSU:
      • Seasonic 600W
      • Case:
      • Cooler Master HAF 912
      • Operating System:
      • Win 10 Pro x64
      • Monitor(s):
      • Dell U2311H
      • Internet:
      • O2 8mbps

    Re: Computer switches off and on after a few seconds

    Well it might be the issue, but if that's the case it should clearly say in your motherboard manual that you must use an 8 pin EPS connector.

    What components have you definitely tested in the other computer - psu, gfx, hdd?

    My first inclination would be that you have a faulty power button on your case - short the power + and grnd jumper on your motherboard (either with a jumper or paperclip) and see if that works. If not, unplug everything and just use the 20/24pin connector between the motherboard and PSU and do the same - the PSU should stay on. If it doesn't then your problem is probably either the motherboard or quite possibly the CPU - try begging a compatible CPU from a mate to test the latter.

    Just aim to get the power supply constantly on at first, once that's sorted you can add in components one at a time.

  15. #15
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    • GavinW's system
      • Motherboard:
      • IP 35 "Raider"
      • CPU:
      • E6750 2.66ghz @ 3.50Ghz
      • Memory:
      • 4GB GeiL DDR2 800MHZ
      • Storage:
      • 1.55TB SataII
      • Graphics card(s):
      • nVdia 8800GTX
      • PSU:
      • 425W
      • Case:
      • HNX
      • Monitor(s):
      • 22" Samsung LCD
      • Internet:
      • 24MB Be ADSL2+

    Re: Computer switches off and on after a few seconds

    I have tried PSU, GFX and HDD in other comp and works fine. I would have thought that the AMD 64 chip with the 8800GTX connected would use more power than my Intel E6750 chipset.

    I will try your suggestions of getting it staying switched on, even if nothing is plugged in except CPU.

    I will also have a lookie at the power jumpers, in case perhaps I have + and - round the wrong way, would that make a difference?

    I would just like to find out which is the offending component, hopefully it will be the cheapest to replace! At least I know its not the GFX card as that is working fine, and is the most expensive to replace!

  16. #16
    Mostly Me Lucio's Avatar
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      • Internet:
      • 16Mb Plusnet

    Re: Computer switches off and on after a few seconds

    Sorry! Missed this one earlier.

    Dead simple really, it's a quirk of that motherboard (and in more general terms the chipset).

    Just update the BIOS to a newer version and the problem should go away because it really does sound like the standard aBit P35 double boot problem (check their forums for more details on this). In the mean time, just be patient with the second boot, let it complete it each time it asks because it's a self-test facility.

    ------

    The hanging during install is possibly down to the RAM voltage or the PSU quality as a whole. Vista and XP also do not like to install with 4GB RAM. Put 1GB in and install using that, then add the rest when the install process is complete.

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