Help Please - Possible dead Motherboard?

First check motherboard is not grounding against the case by using the stand-off's to mount

If the CPU was removed from board,reset after inspecting for bent leads

Use the motherboard manual to make sure that all front-panel connectors are on designated post

Check the back of computer case and see if the switch is turned on

Reset the memory on motherboard,which may not be inserted in socket properly

Hi Vaughan,

Check that you have the small connector inserted correctly on the motherboard for the "power on" from the on/off switch. Remove all other connectors from the motherboard, temporarily. One of them could be wrong and causing it to stay off.

Good Luck!

If you haven't yet, try a different CPU. Also, check that the motherboard jumpers are correct for CPU speed/etc (if not jumperless). Another thing you might wany to try is removing the CMOS battery and putting it back in after about 20 minutes. If those dont work, check also to see if any of the capacitors on the Motherboard look brownish or black on top, one may be blown (Ususally located right next to CPU socket). Hope this helps.

Make sure the video card is fully seated.

It only takes a few 100's of an inch out of the socket for an AGP card to cause the system to not boot.

Also, make sure the memory modules are fully seated.

If all else fails, were you using proper ESD precautions when you swapped the boards?

If not, any and all parts are suspect.

Chas

Aside from the above advice, a known bad motherborad may have passed a bad signal (too high voltage/current) to another component of your system, causing damage to it. If that's the case, I'd suspect memory, as it's likely to cause the symptoms you describe.

you did not say what type of mother board.
mother board quick test can be done by removing every plug in cards plug off every thing that is connected to it such s HD of floppy then make sure the memory and processor is properly plug in, on mother board connect the power plug then your video card or cable to your monitor-- power up the board it should display some text if board, processor and memory are good---

I know you said you check the power supply :) but, are you sure all voltages are ok? I had one with a bad 5 volt (after changing bad mobo) that fried a new mobo. Everything else worked fine- ie. drives spun up, etc.

Thanks everyone for your replies.

I had already tried all of your suggestions.

Have tested the power supply (AT) with both 5v and 12v - both OK

I also established speaker dead - hence no POST beeps.

Seems odd that same MB with differentCPU's and vice versa both produce no display???

STILL LOST

Vaughan

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