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Computer doesn't boot

By jlrera ·
A friend of mine asked me to take a look at his computer. He told me that one day he went to turn it on and nothing happened. I tested the power supply and sure enough it was dead. I put a new power supply in and attempted to start up the machine. The fan on the power supply starts, as well as the fan on the processor. The "busy" light on the cd-rom is lit and the light on the NIC card is also lit. The fan on the video card runs and the hard drive light on the case stays solid red. The floppy drive and the hard drives do absolutly nothing. I do not know what type of motherboard is in the system. He has an Athlon Processor (not sure speed) with 2 hard drives, Primary is a Western Digital Caviar 6.4GB and the slave is a Maxtor 20.4GB Diamondmax Plus 7200. The video card is a PNY GeForce 64MB and I am not sure what type of sound card, just that it is PCI. There are also 2 NIC cards. He also has 512MB RAM (2 DIMMS). What could be the problem? I checked all the connections andthey seem to be ok. Could the motherboard be bad?

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Computer doesn't boot

by bohicam1 In reply to Computer doesn't boot

Sounds like something got fried when the power supply went. I would first check the ram, take one out, then the other, then bot and replace with known good ram. If this doesn't solve the problem, I would suspect the motherboard.
Good luck!

Mike

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Computer doesn't boot

by bohicam1 In reply to Computer doesn't boot

I would even consider changing out the processor before the motherboard.

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Computer doesn't boot

by jlrera In reply to Computer doesn't boot

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Computer doesn't boot

by TheChas In reply to Computer doesn't boot

Based on the dead power supply, start by removing all the plug-in cards, and giving the motherboard a good look over.
Near the CPU, their should be some large capacitors and transistors. You are looking for bulges, or discoloration of the parts.
If you see damaged or discolored parts, the regulators on the motherboard (and perhaps the CPU) are damaged.

Next, take a good look at the modem card. A voltage surge on the phone line has killed many a PC.

If you find no damage to the MB or cards, install just the video card, and disconnect the drives form the MB, and see if the system posts.

If it POSTS, plug in the drives, and see if it boots.

Then, start plugging in cards one at a time until you locate the culprit.

How big ofa power supply did you install?
If this is a socket A Athlon, 300 Watts is the minimum. With his configuration, I would opt for a 400 or 500 Watt supply.

If the MB does not post with just the video card, I would next measure the output voltageson the regulator transistors. If they look okay, I would swap in a diferent CPU.

From here, the next suspect is a motherboard problem.

Chas

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Computer doesn't boot

by jlrera In reply to Computer doesn't boot

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Computer doesn't boot

by joe.brenchley@raymondcorp In reply to Computer doesn't boot

Besides checking the RAM and cards I would check the processor itself it maybe overheating even though fan is turning or may have come a little loose. A certain brand of PC which will remain nameless has had many such incidents in our enterprise.

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Computer doesn't boot

by jlrera In reply to Computer doesn't boot

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Computer doesn't boot

by jlrera In reply to Computer doesn't boot

Swapped the RAM with some from my own machine and it still wouldn't boot. I put his RAM in my machine and it recognized it and booted fine, so I am assuming his RAM is ok. The new power supply that I put in was 350 Watts. Checked to make sure theprocessor wasn't loose it seems to be ok.

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Computer doesn't boot

by jlrera In reply to Computer doesn't boot

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