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My stationary computer keeps shutting down after some time without any error messages. It just shuts down instantly like it's been unplugged.When pressing the Power button it doesn't turn on, unless i unplug it from power outlet and then plug it back. Reinstalled two diferrent versions of Windows 7(x64) and nothing changed. However, when i'm in BIOS it doesn't shut down. Tried:

-Memory Testing - no errors

-Scanned for viruses - no viruses(using Malware Anti-Malware)

-Processor doesn't overheat

-Cleaned all the dust inside the Motherboard(including videocard,ram,processor, power supply)

Also I haven't experienced this issue when I booted Windows 7(x64) in Safe Mode.
Here's a screenshot of my system specifications.

My system Summary:

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  • what exactly are you doing when it shuts down?
    – Yorik
    Commented Oct 25, 2016 at 17:38
  • It shuts down independently. There isn't a specific moment when it shuts down.
    – Mark
    Commented Oct 25, 2016 at 18:53

1 Answer 1

Reset to default
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You have added , and frankly this is what should be tested in the first place in such cases (no pun intended). Borrow one from a friend, and see if it's yours who is a culprit.

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    This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - From Review
    – Ramhound
    Commented Oct 25, 2016 at 16:03
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    This does provide an answer to the question. This answer directs OP to go and diagnose his PC with a borrowed PSU. Nothing can be added.
    – Neurotransmitter
    Commented Oct 25, 2016 at 16:05
  • How can the PSU be the problem if my computer doesn't shut down when i'm in BIOS or Safe Mode?
    – Mark
    Commented Oct 25, 2016 at 18:55
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    Modern PSUs are complex devices, which work in different modes. Once you are in BIOS, PSU's wattage may be the one, and once you are in OS it may be other. Even some sporadic maintenance process, which consumes 100% of CPU time for a little while may cause PSU to fail and thus computer to unexpectedly shut down. It definitely looks like an electric problem to me, thus it is caused either by a PSU (85%) or a motherboard itself (I bet 15% on it). By the way UPS also is a way to go to mitigate wall electricity problem, in case your current is "unstable".
    – Neurotransmitter
    Commented Oct 25, 2016 at 18:59
  • And regarding the Safe Mode. In this mode all drivers aren't usually loaded (just the generic ones are loaded), and some parts of OS are offline, so it is possible, for example, that your graphics card demands a lot of power from PSU when its proprietary driver is loaded (Normal Mode) and significantly less power with a generic driver (in Safe Mode). Just guessing, but you should swap components around to find the root of the problem. Start with a PSU.
    – Neurotransmitter
    Commented Oct 25, 2016 at 19:07

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