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Computer won't turn on


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#1
irrumator11

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My computer suddenly turned off while I was using it, and now it won't turn back on.
I have checked and made sure that all the power plugs are tightly plugged in, and that the power is on.
When I press the power on button, the fan in the back of the CPU powers on, as does the fan on the processor. No lights (neither green nor red) adjacent to the power switch go on.
I have tried switching to another hard drive, as I have a spare one sitting inside the machine, but it didn't help.
My computer is a 4-year-old custom-built one. I'm not sure if the problem is with the motherboard (I have read that resetting it might help, but 1) I have no idea how to re-set it (my MB is Fujitsu Siemens D1675), and 2) if the processor fan powers on, does that mean the MB is ok?)
Help, please?
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#2
The Skeptic

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Most likely the problem is with a faulty power supply unit (psu). The psu delivers different voltages to different parts of the system. It's quite common to have low voltage fail and high voltage (12 volt for fans and disks) working. Replace the psu with a new one.
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#3
irrumator11

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I took out and put back in the MB battery. The computer still doesn't turn on, but now when I push the power on button, the LEDs next to it blink, in synchrony, until I turn the power off.
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#4
wizzy2k5

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Hello irrumator11

I agree with The Skeptic on this one :) If you are getting no power at all and nothing starts up you will need to replace the power supply unit. If it sometimes powers on and sometimes it doesn't I still feel it will be down to the power supply.

Edited by wizzy2k5, 25 October 2008 - 04:33 PM.

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#5
irrumator11

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Thanks, guys - it was the power supply. I replaced it, and now the computer is running fine :)
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#6
The Skeptic

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Thanks for letting us know.
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