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Windows 7: PC constantly shuts off and attempts reboot

25 Apr 2017   #1

Windows 7 Home Premium 64bit
PC constantly shuts off and attempts reboot

I left my PC on overnight at the Desktop with no programs running. When I went to use my computer the next morning, the case and CPU fans were all running at max speed, and the monitor wouldn't display anything when turned on. Also, the LEDs for the CPU and RAM were flashing. The front power button on the case was not turning the PC off either, so I manually switched off the PSU. Upon trying to boot up the computer, the computer would sometimes get past the BIOS screen to the "Windows failed to start" menu and then shut off completely, rapidly repeating this cycle.

I left the computer off for about 10 minutes while I found my Windows 7 install disc, and upon returning I loaded the BIOS defaults, disabling all of my RAM and CPU over locking settings. Once reset, I proceeded to insert the disc and load up the Startup Repair tool after windows failed to start again.

Startup repair apparently recovered my windows 7 Home Premium OS, so I ran a Check Disc on my system drive. The check disc found no corrupted files. At this point, every time I try to start the computer, I get 2 OS options:

Windows 7
Windows 7 Home Premium (recovered)

As well as a "Memory Diagnostic Tool" option selectable by pressing "Tab"

Selecting the recovered OS loaded windows how it always has, and I could log in and use the computer as normal. I ran a malware and Virus scan with no problems found. A pop up window on the taskbar reminded me that there were windows updates that needed to be installed. So I clicked the window and began downloading the updates. At about 5/11 of the updates being installed, the computer shut off suddenly. I wasn't using the computer for anything other than the updates. Then, the cycle began again, about 5 seconds to a minute of Windows failing to start, and then completely shutting off and trying to start again. The CPU and RAM LEDs weren't blinking. I switched off the PSU again for about 5 minutes, and loaded up system restore off the disc again. The option to load from the "Windows 7 Home Premium (recovered)" option was there again, (which loads fine btw) and selecting simply the "Windows 7" option loads up startup repair.

When startup repair checks for problems, this time it can't fix them automatically. The problem details:

Problem Signature:
Problem Event Name: StartupRepairOffline
Problem Signature 01: 6.1.7600.16385
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: unknown
Problem Signature 04: -1
Problem Signature 05: AutoFailover
Problem Signature 06: 1
Problem Signature 07: NoOsInstalled
OS Version: 6.1.7601.
Locale ID: 1033

After seeing this and some Google searching I found that someone else who had these exact problem details was referred to a solution for an "Infinite Loop" problem. (Startup Repair Infinite Loop Recovery - Windows 7 Help Forums) That sounded like what was happening to me. I followed the steps in the tutorial and everything went without a hitch. After that, I rebooted to the familiar black menu screen with the options for either my recovered OS, the regular "Windows 7" OS that takes me to the startup repair, and a Memory Diagnostic Tool option. Upon running the memory diagnostic tool, the computer unfortunately shut off unexpectedly in the middle of the test, and then another automatically repeating loop of attempting to boot and shutting off.

I decided to leave the computer off for a while and come back to try the memory diagnostic tool again, as I feel that the RAM is the root cause of these problems. This time, the test ran fine, with no problems detected. Once the test was finished I was given the familiar OS selection screen, where I selected "Windows 7 Home Premium (recovered)" and windows loaded like normal. I logged in (which took WAY longer than usual to get past the "Welcome" screen) and after a very slow load of all my desktop Icons, I decided to check my temps after a benchmark. I noticed that everything was running very sluggishly, and even trying to load the network settings took about 2 minutes, although task manager said only 6% of my CPU and 3GB of memory was being used. I opened up Piriform Speccy to see that all of my hardware temps were fine, right around 30 degrees Celsius.

At this point I got another pop up from the task bar telling me to update windows, so I clicked it and began installing 15 important updates after creating a restore point. This time, the updates were successfully installed so I clicked "restart now" to finish installing the updates. The system logged off and got to 30% of configuring updates before shutting off. It restarted so I selected "Windows 7 Home Premium (recovered)" again and it began configuring updates to 81% before saying "Shutting Down". It restarted again and I selected the recovered OS. Again the Windows Update Configuration Screen showed up, this time with no percentage. After about 5 minutes the user select screen loaded and I logged in.

I figured the issue was resolved at this point, as I left it at the desktop for an hour without the computer crashing, but while I was browsing the Internet, the computer suddenly shut off again. This happens randomly now and I don't know the cause.

Does anybody have any ideas on how I can fix this?

My System SpecsSystem Spec
25 Apr 2017   #2

Windows 7 Home Premium 64 bit sp1

Hi KingKarrit, welcome to the Forum.

Your problem could be a failing PSU. Diagnosing problems in a PSU can be very difficult & the best procedure is to change it & see if the problem persists of disappears.
My System SpecsSystem Spec

 PC constantly shuts off and attempts reboot

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