Faulty motherboard?

[geezerone]

Hi

Just wondered if anyone has experience of motherboard fault symptoms as I have received and installed an AsRock 939 dual SATAII mobo and installed a 3800+ venice CPU on it but when the machine has power supplied from the PSU (without the front switch being on) the cpu fan and case fans spin very briefly and then nothing. I have disconnected all other original components from working unit (Skt 754 2800+) and still the same. I then restored all components and working as before. I doubt the CPU is faulty but purchased this from different supplier to the mobo. PSU is Hiper 525W.

Any experience of this peeps?

Thanks.

[danroyle]

my mate had similar on an abit board board the board had gone into sleep mode and needed 2amps on the 3.3 or 5v rail to boot from safe sleep mode can't remember how he got his out of it he did something with the psu and eventually it came out might be that but not sure that is the only thing similar that i can think of

[Clunk]

just to rule out any shorts, take out the board and build it all up outside the case on a bit of cardboard. double check that the ram i seated properly, and do the same with the cpu, unplug anything that isnt needed to power up, dvd/cd, soundcards etc. remove any fans connected to the motherboard, except for the cpu fan, sometimes this can cause problems. make sure all power connectors are in properly. try the ram 1 stick at a time in different slots. if you have any spare ram, do the same with that.

i had the same thing happen on a dfi board and they said it was a faulty crystal..something to do with the power circuitry.

[geezerone]

Thanks for the replies. I removed all components apart from RAM, CPU and Mobo and still the same. The RAM worked fine in the original rig and still does. I suspect the power supply section of the motherboard because it tries to power the fans/CPU without need for the front panel power switch to be on or even connected.

[geezerone]

just to rule out any shorts, take out the board and build it all up outside the case on a bit of cardboard. double check that the ram i seated properly, and do the same with the cpu, unplug anything that isnt needed to power up, dvd/cd, soundcards etc. remove any fans connected to the motherboard, except for the cpu fan, sometimes this can cause problems. make sure all power connectors are in properly. try the ram 1 stick at a time in different slots. if you have any spare ram, do the same with that.

i had the same thing happen on a dfi board and they said it was a faulty crystal..something to do with the power circuitry.

Have done this and still the same. Just don't want the expense of returning to SCAN only to find I have to then return CPU to other supplier as have no other 939 solution to test the CPU with.

[Pealy]

Sometimes it's a good idea to do a bios reset (Consult the manual). I once had a board which acted very much as you describe after I 'borrowed' a memory stick from it. The reset worked for me. Good luck.

[FInalD]

Something that may sound quite stupid is to check that your reset switch isn't broken. On a previous case I had the PC doing the same sort of thing and it was due to the fact that the reset button was broken so it as on a perm reset loop.
Only plug in the power switch from the front pannel, RAM, CPU, GPU. Also if you have one don't forget to test the rig with another PSU.

[Flibb]

The spin up when you turn the PSU on (without the front switch being on) is something that that board does anyway. If the system then does FA when you turn on the front switch I would guess at a duff switch or its wired to the MOBO wrong.

[Salazaar]

Again, at risk of asking a stupid question, do you have both the 20 pin and the 4 pin connectors plugged in?

[Curly]

The spin up when you turn the PSU on (without the front switch being on) is something that that board does anyway. If the system then does FA when you turn on the front switch I would guess at a duff switch or its wired to the MOBO wrong.

I'm with Flibb on this on one, on my Asrock ds2 motherboard when I switch the power supply on the fans spin breifly, hit the power button on the case and powers/boot no problem, think it's a quirk of the board, it was same on an old asus AV7 I had years ago, you don't say in your original post weather you have tried the power switch on the case or if the motherboard powers up, if the problem is just the fans spinning breifly, I say don't worry about it, I haven't and had no problems in the year-ish I've had the board.

Curly

[FInalD]

After re-reading the OP it does seem that he just has an initial powerflow spin up when turning onthe PSU as Flibb says.
I thought it was meant that when pressing the main power button on the front of the case the fans span up and that was it.

FinalD

[geezerone]

Thanks for the replies guys, all working ok now (after BIOS reset - thanks for info Pealy) even though the fans spin briefly when the PSU supplies mobo only - doesn't matter as long as it isn't a fault which it sounds like it isn't - an undocumented feature no doubt!

[kalniel]

Heh and I was thinking it was about time we had some ASRock failures - so many of us have the board