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PC Rebooting Randomly - help troubleshooting please

Xplaced

n00b
Joined
Nov 28, 2007
Messages
41
Unfortunately I have a random reboot issue going on. I'm not sure what the issue might be. Here's the system:

i5-2500k (stock)
Corsair 8gb (2 4gb sticks) RAM
500w Cooler Master PSU
ASRock motherboard (b75m-dgs)
Regular CD-RW drive (lite-on I think)
1tb Seagate 7200 rpm hard drive
Nvidia 650 Ti (EVGA)

My system is randomly rebooting. At first, it rebooted in games (2 or 3 times in Skyrim, once in DayZ). So I thought it might be my PSU, because it is only 360w at the 12v rail. But I think that's enough for the system since the graphics only draw 110 max and the CPU I don't think will go over 120w with turbo right now (or maybe it's only 95w that it will get up to). That plus all the other stuff I think is still good on the PSU even if my PSU isn't the best one out there.

Next, I was looking at email about 5 minutes after running 20 minutes worth of FurMark and Prime95 together straight to stress it (with no issues at all I might add) and then it just rebooted. Then, after it rebooted, it hit the Windows Logon screen and randomly rebooted again. Next boot up was totally fine.

The reboots are really random (I know, I've said that already). I don't see anything in particular that's making it happen. I'm wondering if RAM could be an issue, so I'm going to try to find a memory tester and see if that'll make it reboot. Otherwise, what else do you guys recommend I test? Stress testing the CPU and GPU with FurMark and Prime95's max heat/power test I would have thought was a pretty good stress test (ran it in 15 minute and 5 minute intervals with low max temps on both CPU and GPU when it was all done). Tsumi from the PSU section here recommended I do that (thanks Tsumi).

So, what would you guys start looking at now? Memory? CPU bad somehow? Motherboard? (I really hope it isn't the CPU or MB :( ). Let me know what to try from here. Thanks!

EDIT - more information:
Things I've done to the PC since I built it:
1) Try to overclock, didn't get it to work so I defaulted everything in the BIOS.
2) Upgraded BIOS from version 1.0 to 1.10 (seems fine, version took and all that).
3) "Downgraded" graphics driver from latest Beta to WHQL cert driver.
4) Installed/used Throttlestop, Intel X-treme utility, MSI Afterburner (haven't overclocked at all with Afterburner, just using it for the OSD to see temps/GPU/mem usage).
5) Went "driver happy" with some Intel drivers because I had a device that had a missing driver in Device Manager, and from research looked to be an Intel something or other. So I installed 2 or 3 things from Intel that should have fixed it, none did. I just uninstalled those.

Right now I haven't rebooted after running ANOTHER 15 minute FurMark test (with burn in and 8x AA enabled) and running Prime95 max heat torture test for 30+ minutes. All is well. Right now Prime95 is running a memory torture test (not sure how much that's really stressing it though, just says "uses a lot of RAM"). No reboots suffered yet. It's completely random.

I got a new Power Supply (600w Thermaltake) and I'm thinking I might pop that in there just make sure my power needs are satisfied, as well as to check the case/MB/plugs and stuff to make sure nothing is touching weird somewhere and shorting, or something like that. The box isn't moving or being moved, so I don't think anything is shorting. The spacers are all installed under the MB and all that too, so I think all that is fine.

I just don't know what to look into really since everything seems to work great, and then suddenly it all just reboots. It's an instant reboot too - black screen, I hear the hard drive click off like it's shutting down, and then it powers back on by itself. Super weird.
 
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Hi Xplaced,

I've experienced something of that kind myself and I haven't found the solution - yet. But I'd advise you to download the Ultimate Boot CD (http://www.ultimatebootcd.com/) and run Memtest86 (v3.5 or v4.0) and watch out for errors. Plus you might also try Windows Memory Diagnostic (also on the UBCD). If you find some errors, maybe you could ask a friend for some other RAM modules and insert them to test if the problem still occurs.

You might also check the voltage values. In the BIOS you should find an option called "PC Health Status". Have a look if the actual voltage values comply with the desired ones. If not, that may be the problem because most manufacturers only guarantee that devices function correctly within very tight bounds.

Last but not least, could you replace the graphics card with some other card? The card may be damaged and might cause the PC to reboot.

I hope that can help you.

If you fixed this issue, let me know.

See you,
NeilManlius
 
Thanks for the suggestions man. I am running a memtest now. It's memtest pro. I got it for $5, seems pretty popular. I'm running it while also running prime95 and fur mark without any issues so far. So I'm puzzled about what is going on.

I did no put the new psu in yet as I don't see a need to yet. I can return it unopened if I want. But the temptation is great as I think it's better than the one I have in there for my system. ;)

I'll keep the thread updated. I did uninstall some intel software I added as well to troubleshoot. So we will see if that helps also. It might be one of those things where I fix the problem without ever knowing what it was. That would be ok I guess.
 
Hi there!

Xplaced said:
I'm running it while also running prime95 and fur mark without any issues so far. So I'm puzzled about what is going on.
I think you should rather run it from the UBCD to insure that Windows is not distorting the results. Memtest is not very reliable when running under Windows.

You should also check your hard disk (can be done with CrystalDiskInfo).

If you are planning to reinstall Windows, it might be a possibility to run your chipset on the Windows default drivers and to install only network (if necessary), audio and display drivers.

Best wishes,
NeilManlius
 
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Update: I've uninstalled the Intel Smart Connect feature and turned it off in my BIOS. I've installed all the latest drivers for my motherboard (which, I thought I had anyway, but in any case they are for sure installed now). Latest WHQL is installed for the Geforce 650 Ti, and some Intel features are currently installed:

Intel Manageability Engine Firmware Recovery Agent
Intel Management Engine Components
Intel Rapid Storage Technology
Intel Watchdog Timer (I wonder if this is resetting me... gonna keep an eye on this one. Sounds like when it detects something wrong it "reboots". Not sure if I ever need it on my system in the first place).

Not even sure if I need half or any of those on there besides the INF.
 
Thanks for the suggestions man. I am running a memtest now. It's memtest pro. I got it for $5, seems pretty popular. I'm running it while also running prime95 and fur mark without any issues so far. So I'm puzzled about what is going on.
Ok, try a different RAM test:
[Testing the RAM]
Download Memtest86+ v4.20 or whatever the latest version is, unzip it, burn the ISO file to a CD, and then boot from it, just like you would do with the XP/Vista/7 install CD. Let Memtest+ run for at least 15 passes with ZERO errors on each stick of RAM separately as well as test the RAM all together. Go for a full 24 hours if you want to be completely sure that the RAM is not a problem. If you start seeing errors, than your RAM is defective or you have incorrect settings for the RAM.
I did no put the new psu in yet as I don't see a need to yet. I can return it unopened if I want. But the temptation is great as I think it's better than the one I have in there for my system. ;)
Actually it probably isn't. Unless that Thermaltake PSU is part of their Toughpower brand, pretty much the majority of Thermaltake PSUs aren't that good. With that said, you still need a new PSU since more than likely that Coolermaster is a piece of shit PSU. I recommend this replacement:
$57 - Antec NEO ECO 520C 520W PSU

Also, test the HDD:
[Testing the Hard Drive]
Download the CD image of Hitachi Drive Fitness Test, burn the ISO file to a CD, and then boot from it, just like you would do with the XP/Vista install CD. Test the hard drive and see if any problems are found. DFT will run on most manufacturers' hard drives. Alternatively, you can use Seagate's SeaTools for DOS to test a Seagate or Maxtor drive. For a Western Digital drive, you could use Data Lifeguard Tools for DOS to test a Western Digital drive. For a Samsung drive, you could use Samsung's ES-Tool.
 
I am running a memtest now. It's memtest pro. I got it for $5, seems pretty popular.
But is it good? I don't see how a Windows-based program can really test memory well. It's better to use MemTest86, MemTest86+, and Gold Memory.
 
The system stability seems good now. I'm not sure what's changed, but I've run it through gaming and many, many stress tests today. All seems fine.

If I need anymore help I'll post here, but so far everything seems good. I reflashed the BIOS again to make sure it "took" (I may have rebooted it too soon last time during the process) and I also uninstalled/reinstalled some drivers again. Since then, it's run like a champ with no issues.
 
Actually it probably isn't. Unless that Thermaltake PSU is part of their Toughpower brand, pretty much the majority of Thermaltake PSUs aren't that good. With that said, you still need a new PSU since more than likely that Coolermaster is a piece of shit PSU. I recommend this replacement:
$57 - Antec NEO ECO 520C 520W PSU

Why is the one I got crappy? It's working fine, and should have enough juice right? Seemed to be rated well on Newegg too. I know Antec is usually better, but so far this one is working OK. I guess I'm just wondering what specifically makes it crappy. :confused:
 
Why is the one I got crappy? It's working fine, and should have enough juice right? Seemed to be rated well on Newegg too. I know Antec is usually better, but so far this one is working OK. I guess I'm just wondering what specifically makes it crappy. :confused:

Generally, Thermaltake's non-Toughpower brand PSUs can't provide their fully rated power without harming PC hardware under real world conditions. Depending on which one you got, that 600W in reality may only be a 250W to 450W PSU under real world conditions. In addition, Newegg reviews for PSUs should be taken with a grain of salt since the vast majority of Newegg buyers don't know much about PSUs, don't have the equipment to test PSUs, and are more than willing to give good ratings to PSU brands that any computer hardware enthusiast worth his or her salt would know is bad i.e Apevia.
 
Thanks for the info. I might look into a better PSU in the future, especially if I have any issues with it.

On a good note, the PC seems to be fine now. No more issues, so I think all is well. I reflashed the BIOS and upated all my drivers (again) to make sure they were good, and it seems fine now. Stress tested it for a day basically on and off, and no issues. Gaming has no issues either, so I think it's all good now. Thanks for your help guys.
 
FYI, if you have issues with a PSU, you're looking at damaged or dead hardware. So any issue, look at a new PSU right away
 
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