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Computer Won't Turn On!


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#1 David111

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Posted 25 July 2007 - 11:57 PM

About last week, I was just browsing on the internet and suddenly the computer shut down unexpectedly. The computer restarted shortely after that, and about 5 seconds later, it shut down again. It kept on restarting and shutting down 5 seconds later.

After 3 hrs, it finally started up and I was able to go on the desktop screen. At first I thought it wasn't going to happen again, but suddenly, after an hour or so, the computer turned off without any warning!

Then it kept on restarting and shutting down after 5 seconds and kept on doing that. Sometimes it doesn't shut off after 5 seconds and manages to go to the desktop screen, but it always shuts down unexpectedly.

It's been happening over a week now, and today, my computer wouldn't start at all. I pressed the power button but it wouldn't do anything. When I unplug the power cord on the back of my computer and reconnect it, the computer turns on, but it shuts down after 5 seconds.

I read some articles about why this could be happening. I thought it was the heating problem so i opened up the computer and cleaned almost everything. I know it can't be a virus because I scanned the computer when I was able to use it for a short period of time. I don't know whats going on! Please help me!!!

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#2 oldf@rt

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Posted 26 July 2007 - 12:02 AM

Usually the first thing that I would check would be the power supply. If there is an led on the back of the computer, near where the power cord plugs in, let us know if it blinks rapidly when you try to turn on the computer.
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#3 David111

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Posted 26 July 2007 - 12:08 AM

It blinks once when I turn on the computer. It doesn't blink rapidly.

#4 dc3

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Posted 26 July 2007 - 12:12 AM

Another thing to do would be to turn off the automatic restart feature so that you can see what the error message/code is.

1.Right-click My Computer, and then click Properties.

2.Click the Advanced tab.

3.Under Startup and Recovery, click Settings to open the Startup and Recovery dialog box.

4.Clear the Automatically restart check box, and click OK the necessary number of times.

5.Restart your computer for the settings to take effect.

You should also look in your event viewer to see what error are being recorded there.

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#5 David111

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Posted 26 July 2007 - 12:22 AM

Thanx for the reply, but I already tried but of those things. I think beacuse I cleared the automatically restart box, I'm not restarting. I also looked at the event viewer but there were no errors. The computer still has the problem... It might shut off any time soon! =[
I ran a program called SpeedFan to check the temperature, and the temperature is between 20C to 40C.

#6 pascor22234

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Posted 26 July 2007 - 01:26 PM

It might be that the CPU heatsink fan is stalling, but only sometimes. When it runs the CPU temp would be OK, but if it stalls the temp would climb and eventually cause an overheat. Monitor Speedfan's fan speeds. There should be little change in any fan's speed at any time.

On the other hand it may be that the power supply is overheating, possibly because its fan is stalling. You'll have to visually inspect for this. Also, the power supply's voltages may be fluctuating too much, possibly due to overheating or simply because of failing components. Again, you can use Speedfan to monitor the output voltages +3.3, +5 and +12. They should all be well within +/-5% of their nominal voltages.

+3.3: 3.135V to 3.465v
+5: 4.75V to 5.25V
+12: 11.4V to 12.6V




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