Question about ASUS CROSSHAIR Motherboard

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ASUS Crosshair won't boot

I replaced the power supply and it booted once but now won't boot again. The power supplies work in another PC fine so I'm sure it's the mother board. It just almost like the ATX12V 8-pin cord into the MB isn't working, but i've swapped out all cords and power supply so something is wrong there. I'm trying to get my Serial number off of the board but the ASUS site won't accept my serial number on the board? Is there some weird extrapolation I have to use? It looks like C73BUM9-00797-80-MIB050-C04 0502 and I've tried 50 different combinations of the groupings, alternate spellings (substituting 8 and B for example cuz the writing is so small) and the ASUS phone number listed matches the one I have and it is disconnected. please help.

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  • darknova Oct 30, 2008

    I'm having the same problem with my Crosshair II Formula. When I turn it on it just repeatedly restarts. When I unplug the 8 pin +12V connector the power at least stays on but nothing else happens. I bought a new power supply thinking that was what the problem was but the same thing happened when I installed the new one.

  • Toussaint Dec 04, 2008

    I had a similar problem last night. My home PC based on an Asus Crosshair m/b abruptly died and I couldn't get it started again. This morning I tried swapping my video card (single GeForce 8800) to a different PCIEX slot and the computer fired up normally. It works, but I'm not sure about the video card. Something inside the case (m/b? graphics card?) occasionally emits a beep, but I don't know what that is. The point is that if your video card or PCIEX slot went bad on you it could be preventing your computer from starting.

  • Anonymous Feb 17, 2009

    same problem with my

    ASUS CROSSHAIR Motherboard

  • tx_talisman Apr 27, 2009

    Same again - Just bought a 850W Modular - when plugged in and turned on the system powers on but nothing happens - the only difference is that the cpu fan usually spins at full speed for a split second then slows as it's POST screen comes up but this time there is no output to screen and the fan remains at full speed with CPU INIT on the mobo lcd. Confused - sending the power pack back but it's a bit worrying if this will repeat with other power packs too.

  • Brandon Heins May 28, 2009

    I found out that my motherboard, after years of use, finally decided to take issue with my memory. I replaced the motherboard through ASUS support and still had problems installing my memory in dual configuration, and instead have to install them in single configuration in order to boot up. Although the manual says the memory can go up to what i was using, there were NO memory modules certified to actually perform as noted. So I guess, make sure your memory is listed as supported in the configuration you want to use it in by visiting the manufacturer website before buying it.


  • Andy
    Andy May 11, 2010

    colliewob the Asus CROSSHAIR has a 24-pinATX plus instead of the 4-pin there is a EPS+12V 8-pin connector.

    skytrails you say the PSU is working fine on another motherboard yes?, does the other mobo have the EPS+12V 8-pin connector too?

    If it doesn't then the problem could still be with the 8-pin plug/socket?

    I know what you mean about the Asus site btw, it's not that easy to find exactly what you want without running into problems. I found zeros & the letter 'O' can get mixed up a lot

    When your entering your serial are you putting in just the digits or the hyphens too?


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  • Master
  • 778 Answers

Some motherboard have 2 power supply plugs 1 for board 1 for cpu check and see if yours is like this 1 is a wide one with about 15/20 pins in the other is asmall square one with 4 pins

Posted on Jul 26, 2008

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