When I turn on my computer, it turns off automatically in a split second. It stays off.

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thedarkboy77

Commendable
Jun 27, 2016
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I was watching only a Youtube video yesterday, nothing else. My ram is 2gb. Then, my computer suddently turned off. I though it was due to the computer overheating. So, I left it off for 2 hours. After, I turned it on again and it shuts down. I though the power supply wasn't charged. So, I tried again after 12 hours and it's still the same. I switched the red switch 115v to 220v on the power supply. I turned it on again and it works. But, I manually turned my computer off after 10 seconds, because I was worried that this might destroy other components. Should I use my computer with the power supply at 220v?
 
Solution
turkey3_scratch
Do not keep running your computer with the switch on "220V". In power supplies with no or passive power factor correction like yours, when the switch is set to "115V" there is a bulk capacitor inside the PSU that doubles the voltage. When it is set to "220V" this is bypassed. So if you are settings it to "220V" and Canada's voltage is 120V, it is working with a much lower voltage than it is supposed to.

Replace the power supply with a new one is your best option. Why it worked with the switch on 220V beats me, but don't continue using it.
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thedarkboy77

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Jun 27, 2016
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I live in Quebec, Canada.

It's a Compaq with:
- Windows Vista 32
- Processor: AMD AthlonTM 64 X2 Dual-Core Processor 4000+
- Memory: 2048 mb
- Graphics: NVIDIA GeForce 6150 SE
 
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turkey3_scratch

turkey3_scratch

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Jul 15, 2014
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Do not keep running your computer with the switch on "220V". In power supplies with no or passive power factor correction like yours, when the switch is set to "115V" there is a bulk capacitor inside the PSU that doubles the voltage. When it is set to "220V" this is bypassed. So if you are settings it to "220V" and Canada's voltage is 120V, it is working with a much lower voltage than it is supposed to.

Replace the power supply with a new one is your best option. Why it worked with the switch on 220V beats me, but don't continue using it.
 
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Solution
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thedarkboy77

Commendable
Jun 27, 2016
13
0
1,510
Also, I reconnected my power supply to my computer. There are four wires connecting to each parts. The first two connects to my hard drive and to my DVD player. The two other connects to my motherboard. The first wire has 24 pins and the other one 4.
I connected my PSU without the 4-pin PSU-MoBo wire and my computer stays on. But once I put the 4-pin wire back and turn my computer on, then the problems occurs again.
 
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thedarkboy77

Commendable
Jun 27, 2016
13
0
1,510
Hi, I finally tried with two other PSU at someone's house. The first PSU didn't work, but the second one did. The guy has a lot of experiences with computers. Although, even if the power stayed on, he was still suspicious that it wasn't the PSU. So, he removed the heatsink and tested only the motherboard with the processor and with his PSU. The processor didn't become hot when the computer was on. He tried with another processor and it still didn't become hot. Finally, the motherboard was the issue.
 
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