Bad MOBO, CPU, BIOS or ?

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Re: ASRock K7VT6, Athlon 2600+

I left my system running the other day and came back a few hours later to find it had not hibernated but the screen was blank, the fans were running and the power & HD lights were lit. I hit the reset button and nothing happened. I turned off the power supply. Now when I try to power up I only get running fans, and the front led's (power& HD) stay lit.

I am down to the point now where I have 'bench tested" the unit with only the MOBO, CPU (with heat sink and fan), 1 stick of memory and the speaker connected. If I short the power switch the fan starts running, the CPU gets warm but no beeps, nothing.

I think I am down to either a bad MOBO, CPU or BIOS. How do I check this further.

Below are some of the things I have tried:

1. Went thru a multimeter check list, PSU is OK. All voltages on ATX connector OK. All ATX ground circuits on MB OK.
2. Removed all components and connectors from MB & reinstalled
3. Cleared CMOS by jumper, and also tried to clear by removing the battery.
4. I have tried a spare, known good, PSU.
5. I have tried both sticks of memory alone in slot 1.
 
If the CPU is good, the board must be bad or maybe the BIOS? If you have a bad BIOS what hapens when you try to power up?
 
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