Hard drive light stays on and system freezes
You may have a hardware problem of some sort. The first place I'd start is to check the power supply voltages. If one or more voltages is off tolerance, this will cause all sorts of symptoms. if you have a voltmeter check especially the +5, +3.3, +12, & +5 standby voltages. Use this site as a reference http://pinouts.ru/Power/atx_v2_pinout.shtml
If the supply checks out faulty, buy a replacement, or, if tech savvy, you might repair it-- probable component defects= one or more electrolytic capacitors.
Other possible problems are Memory errors (try subbing a RAM stick), hard drive developing errors, or a bad chip on the motherboard. If you have some spare parts, RAM, hard disk, you can try subbing parts and narrow down the problem.
E machine model W3506:
I don't remember the exact symptoms the first time I started having problems because it was several months ago and I didn't have the money to replace the power supply at that time. At that time things started to go bad, like the disc would stop working then the monitor would go blank and finally it wouldn't boot at all.
I replaced the power supply and cleaned the machine last week and things worked fine.
Yesterday the machine shut itself down. I rebooted and it worked fine.
Today it went down and I rebooted. It came up and ran about 15 minutes before it shut down. I rebooted and it worked about three minutes. I turned the power off for several hours and then turned it on and it came up for about three minutes before shutting itself down.
To me its acting like an overheating problem.
Is there a component or a virus that would cause this or do I have another bad power supply?
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It's possible to be a power supply problem. These are frequent. Restarts and shutdowns may be a sign of this. If you say your computer goes into "hibernate" mode instead, it may be software related. Do you have any virus protection on that computer?
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