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new mobo/cpu, inst. modem, no power???

By zekeallmon ·
So, I am baffled... I have just put together a mobo/cpu in its case, powered it up w/ just the RAM, and video... worked perfectly.

THis is a wierd situation, because after i had gotten the good result from the first boot, i put in the drives, etc. Again, all worked perfectly. I had already installed XP pro and XP office. So, i go to put in the soundcard, still worked good. Put in the modem, then get no power at all. I have switched power supplies, tested power supplies. I have reset the Power switch cable on the MOBO, just to make sure there was no bad connections. I have reset the Cmos battery, hoping that I had some wierd IRQ problem. I have taken all of the cards out except video again, no result.

I am lost. I ahve seen fried mobo's/ cpu's before, but not after finishing a simple modem install. I cant figure it out. I have gone as far as reseating the CPU (celeron 900).
Anyhelp would be appreciated. Thanks

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new mobo/cpu, inst. modem, no power???

by zekeallmon In reply to new mobo/cpu, inst. modem ...
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new mobo/cpu, inst. modem, no power???

by TheChas In reply to new mobo/cpu, inst. modem ...

The leds on the Motherboard are on because the power supply is supplying the 5V standby power.

If you have a voltmeter, or an oscilloscope, check what is going on at the Power switch pins, and Pins 5, 9, and 14 on the ATX power connector.

I have revived a couple of locked up systems by re-moving both the CMOS back-up battery, and disconnecting power.
In fact, if power was still connected when you removed the CMOS battery, the CMOS was NOT reset.

Chas

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new mobo/cpu, inst. modem, no power???

by zekeallmon In reply to new mobo/cpu, inst. modem ...
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new mobo/cpu, inst. modem, no power???

by djent In reply to new mobo/cpu, inst. modem ...

If you have another machine available, try you PS in it and the old PS in the new machine.

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new mobo/cpu, inst. modem, no power???

by zekeallmon In reply to new mobo/cpu, inst. modem ...

I had already tried that, thanks though.. zeke

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new mobo/cpu, inst. modem, no power???

by zekeallmon In reply to new mobo/cpu, inst. modem ...

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