Motherboard: No POST, No BEEPs PLEASE HELP!

Discussion in 'PC Hardware' started by Liebo, Apr 6, 2010.

  1. Liebo

    Liebo MDL Member

    Jul 9, 2009
    133
    2
    10
    My PC switched off the other day by itself and now I get no post, no beeps.

    Its and Asus P5B and I've tried different CPU and PSU on it.

    Drives spin up and onboard motherboard power LED on but no chassis power LED. Just the HDD LED permanently lit. Optical drives do not eject :/

    It doesn't even beep when no RAM installed.

    CPU does not get warm, even without heatsink on.
     
  2. starams5

    starams5 MDL Member

    Feb 5, 2010
    146
    15
    10
    #2 starams5, Apr 6, 2010
    Last edited: Apr 6, 2010
    It could be anything from a short, bad capacitor, or corrupt bios. Whatever the problem is its preventing the bios from communicating with and initializing the system devices. It might be time for a new board. Try this, remove all the memory sticks and clear RTC ram, add one stick to the B1 slot and see if it will post. Might want to try another CMOS battery as well if you have one although there should have been signs the battery was failing. Too much dust inside the case could be another factor but it might be to late to clean it, blow it out anyways if it hasn't been cleaned in a while.

    Clear RTC RAM (3-pin CLRTC):
    1. Turn OFF the computer and unplug the power cord.
    2. Remove the CMOS battery.
    3. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on
    pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2.
    4. Reinstall the CMOS battery.
    5. Plug the power cord and turn ON the computer.

    I seriously doubt a CrashFree bios recovery will work but if the above doesn't do any good you have nothing to loose. Download the P5B user manual from the ASUS site and see: 4.1.4 ASUS CrashFree BIOS 3 utility
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  3. Liebo

    Liebo MDL Member

    Jul 9, 2009
    133
    2
    10
    Thanks.

    I'll try the CrashFree as I've exhausted the other (but brilliant) ideas you've suggested :)
     
  4. starams5

    starams5 MDL Member

    Feb 5, 2010
    146
    15
    10
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  5. 2centsworth

    2centsworth MDL Senior Member

    Feb 12, 2008
    333
    24
    10
    CPU not getting any current is a bad sign. Likley the repair is not simple.