Solved: Computer Doesn't Boot and...

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TheShooter93

Cody
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Hello TSG,

I'm working on a computer which, upon my attempt to boot, only the processor fan spins and a constant beeping sounds.

We've tested the 24-pin power connector with a multimeter and all the voltages except one are exactly what they should be (the purple wire is slightly over the voltage the PSU says it should be).

I've also tested the RAM and I still can't get it to boot.

The main power button doesn't work either, so I have to turn the PSU on and off to get all of this to happen.

Does anyone have further ideas? Something screams power supply to me, but the multimeter checks it out.
 

crjdriver

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43,453
A multimeter is next to useless unless you are putting the pw supply under a load. You posted that the pw button does not work. If you are switching the pw supply ON with the switch in the back of the pw supply, the mb still should test the "pw good signal" before switching ON. Simply moving the switch on the back of the pw supply should not do anything until the pw switch pins on the board are jumped or closed with the pw button.

If it is powering on without you jumping the pins, I would suspect the board has a problem.
 

DaveBurnett

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The frequency and number of beeps means something. Count them and report them here.
 

TheShooter93

Cody
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I know about the importance of the frequency of the beeps, but they would go on forever if I let them, so there isn't anything about them I can report, sorry. No real pattern other than about a second in between each beep and it continues for as long as the power supply is switched on.

It sounds more like an alarm for incorrect voltage or temperature problems.

Also, I'm not exactly sure what you mean by "jumping the pins", but here's what I'm doing: Regardless of the state of the power button in the front of the computer, when I turn on the PSU using the switch on it, the processor fan turns on and the indicator LED in the motherboard is green.

Having said that, this only happens once every few times I turn on the power supply. The other times nothing will happen, or fans start to spin then die.

Hopefully that information is of some help. Thanks for your help guys. (y)
 

dai

Joined
Mar 6, 2003
Messages
11,198
check the beep code here

www.bioscentral.com

what are you running
video card brand and model
cpu
m/board
ram
power supply
brand
model
wattage

check the listings in the bios for 12v line voltages and temperatures and post them
 

crjdriver

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Pull the lead off of the pw switch pins on the mb. Now either plug in the pw supply or switch it ON. Does the system attempt to pw ON now?
 

crjdriver

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43,453
I will be off for the night and I will check this in the morning. Good luck.
 

TheShooter93

Cody
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Jul 9, 2008
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Hey crjdriver,

Thanks for the help. The owner of the computer decided to take it to a shop to have them test an alternate power supply and troubleshoot further.

If I get my hands on the system again soon I will post the results from your desired test.
 

TheShooter93

Cody
Thread Starter
Malware Specialist
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11,250
Update:

The diagnostic test said both the power supply and the motherboard are fried.

Will be getting a new tower.

Thanks everyone for the help. (y)
 

dai

Joined
Mar 6, 2003
Messages
11,198
not good news but at least you know what was the problem
 
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