After turning on my pc for like 2 or 3 hours i hear the fan spining very fast and suddenly it shuts down it self,and i try to turn it on again and it shuts down again at the moment it reaches the desktop.i need to wait after an hour or something like dat to turn it on again for it to be normal.
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Re: shuts down it self
Sounds like you have a heat issue.
Is the fans clear, or are they clogged with dust, hair, etc? Check the cpu heatsink as well for dust, etc.
It sounds like the cpu thermostat is shutting the system down.
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You can check you suspicion by taking the side off the tower and see if the chip and/or tower fan (if equiped with 2 fans) and make sure all fans are turning at a pretty fast rate. If the components over heat, the computer will shut down to protect itself. The other issue could be a failing hard drive. Does your computer have any hardware diagnostic software available on CD maybe?
The thing it sounds like to me is that the computer is overheating. Do you happen to know if the fan has stopped? I would, if your confident, take the side of and turn it on, see if the fan on the processor is spining. if not it would need replacing.
Verify your fans are for the CPU and case are moving. You can remove the Pc cover and turn on the Pc. Watch the cooling fan on top of your CPU heat sink, it should begin spinning when you turn on your PC. If it doesn't then with the PC unplugged, make sure the connector for the fan is seated properly. From behind the PC you should be able to feel the Power Supply cooling fan moving air. Either of these could cause your PC to over heat and shut down.
Since you do not hear the fan anymore I would start by opening up the case and seeing if power is going to the fan and make sure any connectors for it have not come loose. If the connectors are still hooked up chances are the fan is shot and needs to be replaced.
If you are not familiar with working around electronics and parts under power I would highly suggest you have some one who is familiar with this do it.
Have you gone into the BIOS to make sure there aren't any power managment features? Do you get the same thing happening if plugged into a different wall socket? Sometimes bad power surges can cause this problem. Other issues have been known to arise from motherboard problems. Or NIC power settings...strangely enough...a quick way to test if it's NIC related might be too unplug any cables from the NIC to see if it stays on or not? There are power settings on NICs in advanced settings. Let me know if any of that helps and remember to rate the solutions. Thanks!
remove the side panel and have a look if your cpu fan is turning.... you may need to blow the dust and dirt out of it as well... if the tower even feels remotely warm that's likely the issue... also check the fan on the power supply. either way it will likely need to be cleaned