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Bad Mobo?

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8 replies

by theq

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Hello fellow A+ Technicians!!

I am having a problem with one of my computers here at home. I have an AMD k6-2 400, with 64Mb ram. Problem is when I turn on the computer, nothing happens.... No BIOS beep, No video, nothing. I have tried runningthe system with nothing but the Memory, and Video card. I even tried running with out anything on the board. Any suggestions as to what going wrong? I have my suspicions.....

8 replies

by otl

Does the fan run?
YES - got at least minumal power.

Do any lights light?
YES - Got -5 volts

Check power supply output voltages, are any way below tolorances or missing? Replace as needed.

If voltages are correct, MOBO appears to be Out ToLunch.

Good Luck!

by otl

Whoops!

I forgot the most basic, is there power to the outlet?

Does the monitor power on light up? Does the surge suppressor light up? Popped breaker on the surge suppressor, just reset!

by theq

Thanks! I should have explained what I did a little clearer. I did check everything, voltages, fans on, used outlets that I know work. There was power through the PS to the chip fan. I meant that Nothing happened as far as the computer starting up. I checked the PS and the voltages from that were good. I changed it 3 times, just to be sure. I ran the system with out the RAM. Same 'nothing'. Its the Mobo then.

by mckaytech

If "no nothing" also means no power supply fan, I would strongly suspect the power supply and would measure the voltages at the connection to the motherboard.

If the power supply is good, I would probably try removing the motherboard from the case and then bringing it up with only CPU, RAM, video card and keyboard. My rationale for this is that I have sometimes found a motherboard shorted to the case and it behaved just fine once it was removed.

If it still doesn't come up, it could be the CPU, the RAM or the motherboard but the only way to test from there is by substitution.

paul

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