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Thread: Just replaced PSU, can't get PC to power up

  1. #1
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    Just replaced PSU, can't get PC to power up

    My Enermax PSU failed on me the other day, got an RMA back today with a new unit so have replaced it.

    I'm not very good at PC stuff but I took the old one out and put the new one in.

    I have a PK5 Asus board. It was a custom built system Vadim did for me so I'm doing my best to repair it.

    I've connected the large block to the main board socket directly from the PSU and also the 2 square 12v sockets.

    I have power going to the mobo as the green light is on.
    I can also see a light on the front of the pc I think on my card reader so power is going in.

    I've connected the hard drives and the cd rom and the fan controller as well as the graphics card.

    I've checked and double checked all connections are secure.

    Problem is when I press power, I don't get anything, not even a flicker from the system, no beeps no noises either.

    I'm at a total loss as to what the problem is, originally I had a PSU 650 in there but after 2 failures in a short period of time Enermax upgraded me to a Modu 82+ apparently there is a drop of 20W but overall they tell me the PSU is more efficient and an upgrade.

    I'm at a loss as to where I go from here.
    I don't think I've missed anything so I'm wondering if perhaps the board is blown?

    Can anyone help?

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    Re: Just replaced PSU, can't get PC to power up

    Have you connected/made sure the power on cable from the case to the Motherboard is on correctly?
    Last edited by Trash Man; 30-09-2008 at 11:06 AM.

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    Re: Just replaced PSU, can't get PC to power up

    Not sure I can get to it as it's behind the metal casing.
    I'm also not sure where this wire goes as I don't have the mobo diagram?

    It was working fine before the problem but yes it could be this.
    Could you point me in the right direction to it at all?

    Thanks

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    Re: Just replaced PSU, can't get PC to power up

    Quote Originally Posted by kinkladze10 View Post
    Not sure I can get to it as it's behind the metal casing.
    I'm also not sure where this wire goes as I don't have the mobo diagram?
    Thanks
    Go to http://support.asus.com/download/dow...n-us&model=P5K, select your OS, then it's the last item in the Downloads - Manuals. Go to that page and select which PDF(s) you need.
    You'll need Cookies enabled and the site is very slow; the download could take a long time as well (Asus is low-tech and can't afford a decent server ;-) )
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    Re: Just replaced PSU, can't get PC to power up

    Ok thanks , had a look and I dont think it is this.

    I pressed the power button and there was flicker of blue light on the power, the fan literally twitched as well but that was it.

    It's totally dead.

    Tried another PSU and it blew the fuse on that so I'm guessing the mobo is dead. Even though it has a green light on it, there is a fault somewhere.

    Going to order a new mobo and go from there.

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    Re: Just replaced PSU, can't get PC to power up

    Sounds like the mobo to me.

    I have had an experience of five ASUS boards that finally kicked the bucket and they all went this way.
    With the false hope of a kick starting psu and the green light on.
    Damn false hope!

    Hopefully it is not but It would appear that it very well might be!
    Good luck with the new board, keep us informed.

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    Re: Just replaced PSU, can't get PC to power up

    sorry to hear your having issues here, always its a good thing to check to make sure that you have not knocked free any of the conections from the front panel to the pc as these tend to only just fit on the pins on the motherboard and can come free pretty easy.
    The fusing of another PSU does seem to indicate a much more serious issue though. Good luck with the new motherboard

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    Re: Just replaced PSU, can't get PC to power up

    Well I put the new mobo in this morning after it arrived and low and behold the system is alive

    I actually surprised myself by taking it all out and putting it back together again.

    So far I have the GPU, soundcard and 1 stick of Ram in.

    I booted up, had a quick poke in Bios but after that it booted into windows.

    It's asking for drivers so can I just install the new drivers for the new mobo or do I need to completly reinstall windows?
    The mobo I have is a slightly different model to one I had before?

    A few things are causing me problems however.

    I need to put the rest of the RAM back in, the RAM is A-data 800 to 1000.
    I'm not sure how I configure this in the bios?

    Also I have an Icy Box 16-in-1 internal/external USB Card reader which connects at the front which is my usb front connectors as well. I've tried looking for their website on how to connect this?

    It looked like it went into the connections for the USB slots somewhere, I've tried to put it back in, but I can't get it to work.

    New Mobo is P5K Pro Asus btw.

    Any pointers?

    Cheers

  9. #9
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    Re: Just replaced PSU, can't get PC to power up

    It's good practice to do a full windows install with a new mobo, but you can do with via a windows "repair", that should do the job fine But if your windows is an OEM copy you might run into trouble when it comes to activation. It will probably take a call to MS at the least if you have upgraded.

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    Re: Just replaced PSU, can't get PC to power up

    ok well I'm pretty close to getting this almost back to full status.

    My one problem is I can't get the system to post with 4 sticks of Ram in though.

    It will post and boot with both 1 and 2 sticks in, but as soon as I add 3 and 4, no go.

    Also I've lost some usb connectivity and I can't get my front panel usb to work either.

    I've plugged in the USB and the 1394 socket connector, and then I have a 5 pin black thing but when I had that in the pc said it was overloaded with usb or something and would shut down in 15 secs.

    No idea how to sort this ram issue out though.

  11. #11
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    Re: Just replaced PSU, can't get PC to power up

    The RAM issue is probably a lack of power. Enter the bios with one or two sticks, change the RAM voltage to that which is on the label and then give it a shot. It might also be the northbridge struggling with the 4 sticks so if you still have problems then you might want to give the northbridge voltage a little bump.

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    Re: Just replaced PSU, can't get PC to power up

    Ok cheers,

    Never done this so don't want it to go bang

    Looking at the ram it only gives me 800* 4-4-4-12 or 1000* 5-5-5-15 on the sticks
    Nothing on the voltages.

    Currently all my voltages are set to "Auto"

    I can see, DRAM Voltage and NB Voltage,
    If I try and change it, it starts at 1.25

    DRAM starts at 1.80.

    What would be a safe starting point?

    Thanks

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    Re: Just replaced PSU, can't get PC to power up

    ok quick update

    Got 3 sticks in and posting, everything is on auto except DRAM which is 1.98 and NB Voltage which is 1.41.
    If I put a 4th stick in the system hangs on the Bios screen.

    When I boot I'm getting a system hault telling me "Overlclocking has failed"
    I'm not actually overclocking anything as far as I am aware so unsure how to make this go away.

  14. #14
    finding nemo staffsMike's Avatar
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    Re: Just replaced PSU, can't get PC to power up

    Well I would imagine your sticks are 2.1- 2.2V at 4-4-4-12 and 800MHz.

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    Re: Just replaced PSU, can't get PC to power up

    ok i'll go for that, should I set all those settings in the Bios as well as the voltage or leave the timings as auto?

    Also any tips on what to put for the NB voltage?

    thanks

  16. #16
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    Re: Just replaced PSU, can't get PC to power up

    No Idea on the NB tbh, once you have the sticks at 2.1 - 2.2 i would try the NB stock (auto) and then see what happens. If it needs more then do it in the smallest increments you can.

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