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PC reboots randomly

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  • Components
Last response: in Components
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September 30, 2014 6:14:11 PM

My PC setup (10 month buy):
MB: MSI Z87-G45
CPU: i7 4770
RAM: 1 Dimm Crucial Ballistix 8GB 1600Mhz
HD: SSD SanDisk SataIII 64MB
VGA: MSI N650 (Geforce GTX650 1GB DDR5)
CD/DVD: DVD-RW Samsung SH-224DB
CASE: Corsair Carbide 200R
PSU: Corsair VS450

I use the on board vga (Intel HD graphics) too for second screen.

I was using the OC settings provided by the MSI Command Center utility that comes with my MB.

10 months not a single problem. Pc usage: games (browser-flash and stand-alone), movies, code development (web, databases, wamp, sql server, php/html, etc).

As of lately my PC started to reboot at random occasions. No blue screen, no memory dumb.

Firstly I thought temperature so i monitored with Command Center, Core Temp, CpuZ and brought back the OC settings to the "default optimized" as the BIOS says.

Tested memory with the windows built in utility (mdsched) and no errors came up. Run boot memtest86 (3+hours, 4 passes), no errors.

Installed and run the furmark test for gpu with no errors or reboots (setting 1280x720, for some reason it wouldnt launch the max setting 1920x1080 cause it said it couldnt go fullscreen).

Run the cpu burn-in test of furmark, no errors, max temp 68 C.

Run the system files scan-repair of win (sfc /scannow) which found and repaired some damaged files.

Disabled the onboard graphics card (and my second screen too).

Last I made a BIOS update and a full format / clean installation of windows.

After the clean installation, on one card/screen, I opened 3-4 different browser windows with many tabs, with flash player on them, online games, youtube, "heavy" websites,etc. At the same time run a full AV scan, opened and closed various applications, etc. So i got a RAM usage of ~70%. No reboot.

But when i left the PC open with the AV scan and an online game running and check back after 1 hour the PC had rebooted.

Plus later (having renabled onboard grapics-second screen) i installed some more applications (sqlserver, codelobster, etc) all fine and sometime after I had 3-4 reboots back-to-back practically with nothing running (only chrome with 4-5 tabs, email, etc).

All in all, seems that the reboots happen less often when onboard graphics disabled but still happen. And those reboot occurrences are not following any pattern or particular actions or apps.

So Im trying to figure out what might be causing them.

Is it the PSU? Is it some hardware fault on MB? Is it a faulty Dimm? Is it an HDD fault? Any suggestions?

More about : reboots randomly

September 30, 2014 6:21:32 PM

Could be the PSU if its not bluescreening. Look in event viewer under windows logs / system for errors.

About the time, it happened.

If there's any event ID: 41 errors, (kernel-power) then this maybe a PSU prob
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September 30, 2014 6:28:33 PM

I would look at the PSU - minimum PSU recommended for your GPU is 400W - so you could be running at a "high load" for the PSU. Given your other components, I would look at a 500W - 550W PSU to ensure that you are maxing out the PSU.
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October 1, 2014 3:01:03 PM

Had to take the PC to a store for service cause i couldnt work at all. The reboots came with like 5 minutes intervals.

They said they tested it and the problem was on my SSD. I replaced it with a Samsung 128GB 840 Pro.

Now doing OS and drivers instalation. Will keep u posted if problem solved and if reboot happens again i will try to find the event on windows log (if any...) as Paul suggested.
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October 1, 2014 6:09:23 PM

Well reboots are still here.

Installed OS, drivers, Comamnd Center and Chrome. And then i went to the System page of the control Panel. When I tried to do the Experience Rating Test of Windows 7, reboot.

I disabled onboard vga, run the test again, reboot again.

Event viewer: 2 Critical events ID 41 Task Category 63.

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October 1, 2014 6:12:58 PM

Thing you need to replace the PSU
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October 1, 2014 6:44:48 PM

I'm on warranty. So should i go for a new of the same Corsair VS450 or go for something "bigger" like Corsair CX500 ie??
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October 1, 2014 6:49:06 PM

The CX maybe better
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