Question about Compaq (261671-001) Motherboard

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Faulty Power Supply?

I am trying to build a Compaq presario tower PC and am running into boot issues. The power supply light on the back shows green. When I turn the machine on it powers up the HD and the button on the case shows green for power but that's it. No video at all. I reset cmos and still nothing. The power supply is working as far as the fan and all lights are green. No beep codes either. HELP!!!!

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  • yamadude Dec 22, 2007

    I am very well versed on connections for power supplies. All of that is alright. Both go into the main board and are snug and installed. I have done the memory thing and as far as cards there was only 1. A network card and I pulled it. According to the guy that I got this thing from all was working well before I got it. I would doubt that from anyone else but he is a power seller on ebay with %100 positive feed back. Also the keyboard lights up for a split second when I turn the unit on but no lights after that. All the jumpers on the one hard drive I have are set correct. Plugged and unplugged the cd drive and switched hard drives also. If I could only get cmos I would be in the clear. But to my dismay no freakin video at all. Just a nice amber light on my monitor.

  • yamadude Dec 22, 2007

    It's an integrated sound card and video card MS-6577 v3.1 (Neon). I hate to start this buying stuff thing without knowing what the problem is. I wish the power supply didn't have a green light and made god awful sounds when I turn it on. That would be easy to figure out. I looked at the pdf manual to see if maybe I had plugged something in wrong but I hadn't. I wish it made a beep so I could track it down. Thats to easy though. If you get an answer before I do let me know. Thanks.

  • bsbiker Jan 29, 2009

    I have the same MB and has always worked perfectly untill last night when I upgraded (?) the bios. It seemed to work after the flash and then it went to sleep and now the computer just beeps even if I turn it off and back on, it just beeps. Help

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Take off the center heat sink and check the coprocessor. I bet you find it is black as it has overheated and fried the board. From what i have heard from my other techie friends they state that the power supply puts out to much power for the board to take and as you can tell... your problem and mine with the above stated board is that we need to replace it and throw away the old one.

Posted on Dec 20, 2008

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The power supply has to have an extra 2 pin plug that plugs intoP9. I think it powers the video PDP-121 PSU is the one you need

Posted on Apr 01, 2010

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Where do you get a pdf of the manuel for this motherboard...I have been trying to find one, thanks!

e-mail me at steveinfl22465@verizon.net

Posted on Nov 18, 2008

I am very well versed on connections for power supplies. All of that is alright. Both go into the main board and are snug and installed. I have done the memory thing and as far as cards there was only 1. A network card and I pulled it. According to the guy that I got this thing from all was working well before I got it. I would doubt that from anyone else but he is a power seller on ebay with %100 positive feed back. Also the keyboard lights up for a split second when I turn the unit on but no lights after that. All the jumpers on the one hard drive I have are set correct. Plugged and unplugged the cd drive and switched hard drives also. If I could only get cmos I would be in the clear. But to my dismay no freakin video at all. Just a nice amber light on my monitor.

Posted on Dec 22, 2007

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I always say this and many times people yell at me...so please don't be offended.

There are two power supply cables. One is long and rectangular, the other is a small square shape. Are they both plugged in?

If they are both plugged in then the next step is to pull the memory, remove any boards (graphics, modem, ethernet, etc) and disconnect all the drives. Try booting it with everything removed. If you still hear no post codes then it is either your power supply or motherboard.

If it will POST (Power On Self Test) with everything disconnected then start adding items one at a time and see if it fails again. If it does fail you will have hopefully found the problem component. However, if it's the power supply it still might work with only a few items plugged in. It will take some experimentation to nail it down.

I hope you will take just a moment and tell us if any of this helped.

Posted on Dec 22, 2007

  • ohiotom Dec 22, 2007

    Here's a link to the Compaq POST beep codes:



    http://www.bioscentral.com/beepcodes/com...



    If those codes are correct then your computer is not passing the POST which means your problem is probably not related to the CMOS settings.



    Does this board have integrated video or are you using a card? I was talking with another poster this morning and he had similar sympoms and found that it was the VGA card that was causing him problems. I know you mentioned pulled the only card so I'm guessing it's integrated.



    I think you're down to either the power supply or the motherboard. You sound like you know what you're doing. If you figure out what's causing this I hope you'll let us all know.



    Good luck.

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