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Is it the PSU or the M/Board

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3 replies to this topic

#1 voip4africa


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Posted 16 April 2010 - 07:12 AM

I have a very weird problem. My computer does not respond upon booting. It powers up but there is no response - the monitor stays in standby, the activity light on the CD-ROM stays ON, but in a multi-coloured manner and there's nothing I can do.

Maybe I'm wrong, but it looks as if power is coming to the M/Board from the PSU but not returning to the PSU to boot up the PC

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#2 dpunisher


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Posted 16 April 2010 - 11:06 AM

Reset CMOS/BIOS to default and try to reboot. Any beep codes?

I have had bad memory, bad CPUs, bad motherboards, shorted drives and bad PSUs all cause this problem. I usually end up swapping parts till it works, but I understand for most this isn't an option.

If it doesn't boot after a BIOS reset, open it up and check voltages at a spare 4 pin connector. Yellow to Black=12V, Red to Black=5V.
Unplug the hard drive, and CD/DVD drives, unplug all USB devices, see if it boots. Examine the board for any bad/swollen capacitors.

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#3 MrBruce1959


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Posted 16 April 2010 - 03:57 PM

I agree with dpunisher's advice above.

I want to add that a common issue with computers today is oxidation buildup on connectors, this includes any add-on cards that are pressed into motherboard slots (e.g Video cards, sound cards etc.)

Try reseating every connector, through out your computer, this includes all power and data connectors to drives such as hard drives and optical drives.

All add-on hardware, such as video cards, sound cards, modems etc.

The power harness cable from PSU to Motherboard.

I have even gone as far as re-seating those plastic coated jumper connectors located around the motherboard, making sure of course I put the jumper back on the same set of pins it was on before removed.

The reason for trying this is to see if oxidation buildup on a connector may be the reason for your problem, in a lot of cases, it has successfully resolved a lot of problems.

It's worth a try. IMO

Good luck.
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#4 cryptodan


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Posted 16 April 2010 - 06:52 PM

I agree with Mr Bruce look for any corrosion around any components or around the installation screws for the motherboard.

Can you take a picture of the inside of your case?

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