why does my computer keep shutting down randomly

Why does my computer turn off without warning? This document is for computers that turn off and remain off after an extended period of use. It is not for, or. Some of the steps below require you to work inside your computer. Before opening your case, be aware of the dangers of. Most computers today are designed to turn off automatically if any of its inner components overheat. Often, heat related issues occur when the computer is working hard, e. g. , playing a graphically intense computer game. Start by verifying the fan on the is working by examining the back of the computer. The fan should be moving quickly and smoothly. All other
in the computer require you to to inspect them. Once you have access to the inside of your machine, examine the processor ( ), and. If you have heard any abnormal noises coming from your computer, such as a high squealing sound, it could be an indication of a fan malfunction. If you find that the fan in the power supply is not working correctly or at all, and the power supply is very hot to the touch, you may need to replace the power supply. An overheating power supply, due to a malfunctioning fan, can cause a computer to shut off unexpectedly. Continuing to use the faulty power supply can result in damage to the computer and should be replaced immediately. If your issues are on a, we do not suggest opening the computer. Instead, verify the fan on the side of the computer is working and blowing out hot air. Also, with a laptop, you may want to invest in a to help lower its running temperature. Working on the interior of your machine provides an opportune time to. Dust, dirt, hair, and other trapped debris can prevent proper air flow, which may lead to overheating.


If your monitors the of the fans, and make sure the BIOS does not report any errors. Software utilities such as can also be used to help monitor fans in your computer. Check the processor heat sink to make sure it is properly seated and has the correct amount of thermal compound. If you do remove the processor heat sink, should be cleaned off and new thermal compound should be applied. Before attempting to remove any hardware, rule out hardware conflicts by. Any failing component in your computer could cause your computer to unexpectedly turn off without warning. If you have recently added any new hardware, remove it from the computer to make sure it is not the cause of the problem. If you have not recently installed any new hardware into the computer, the next best solution is to systematically remove non-essential hardware. For example, remove your modem, network card, sound card, and any other expansion cards that are not needed for your computer to operate. Running the computer without these cards may help diagnose your issue. Make sure any or Uninterruptible Power Supply ( ) is not the cause of your problem by connecting the computer directly to the power outlet on the wall. Also, if you have a UPS that connects a cable to the computer to manage power saving features, make sure it is also disconnected. If this resolves your problem, you may have a defective surge protector or UPS. In the case of the UPS, there may be other issues, such as a UPS overload or UPS drivers, reporting bad power situations that cause your computer to shutdown. Make sure there are not too many devices connected to your UPS and that it has the latest software updates.


Your computer may be infected with a or other that is designed to shut down your computer upon certain conditions. If your computer seems to be turning off when executing a certain program at specific times of the day, it could be infected. If you believe your computer may be infected with a virus,. If you already have one installed, make sure your, then run a full scan. If after following each of the above recommendations your computer still continues to shut off, it is possible you are experiencing a problem at the operating system level. To see if this is the case, try the steps below. Reboot the computer and as the computer is booting. After you have loaded the computer in CMOS setup, let the computer sit. If the computer does not turn off after staying idle in CMOS, your operating system installation may be corrupt. We recommended that you. If your turns off abnormally during (or just after) installation of your, it is likely that other is failing in the computer. Often, the hardware causing the issue will be either the, or, in that order. If you have extra parts or know someone who has a similar configuration that allow you to try their hardware in your computer, you can swap each part to determine if it is at fault. Otherwise, you need to have your computer serviced. Curious. Clearly from your description, the machine is shutting down at random intervals but it isn't a random shutdown, "something" is telling Windows to shut it down, otherwise, you wouldn't get an orderly close, which is what you describe. As Bob said, there may/should be some clue in the event logs. Recheck them all carefully.


If the logs go back before this started happening, compare a shutdown you requested with one of these unscheduled ones, to try and identify the "something". It's unlikely to be Windows itself, because in most cases, a Windows error would result in a Blue Screen stop, rather than an orderly shutdown. It could be hardware but you've eliminated most of it by swapping it out. Even then, most serious hardware errors result in a hard stop, not an orderly shutdown. When you say you disconnected the "start button on the case", which end of the cable did you disconnect, the button end or the motherboard end? If it was the button end, it could still be a faulty cable shorting internally. Pull the plug off the motherboard and then VERY CAREFULLY short the contacts to restart the machine. If you are not absolutely sure which contacts control the main power, DON'T DO IT, you could easily fry the mobo and other components. I assume you bought your Windows 7 from a reliable legitimate source - some early evaluation copies, have found their way on to the market, hacked to bypass the date expiry check and are still being sold as genuine. Since you have a spare hard drive (you say you swapped it out), it might be worth just doing a straight reload of Windows, nothing else, and see if the machine continues its erratic behaviour. If not, it's some software loaded on afterwards, or some malware or rootkit lurking somewhere undetected. You might also want to try running a Live CD version of Linux (I'd recommend Knoppix) to see if that suffers the same problems. If so, its logs may point you in the right direction. I'll be interested to see how this turns out.

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