Newly built PC crashes and shuts down at random.

[Nexoz]

Hello,

I've been having this problem since last Saturday and I've been trying to sort it out, it's really starting to drive me crazy.

I had spent £400 on computer parts had an IT tech install them all, and he made sure everything was installed correctly and it seemed like we were ready to go.

But I've ran into the same problem that my old PC used to do, the PC would just freeze at random, sometimes it would crash in 2 hours or it could take up to 2 days or an entire week.

This new built PC however seems to crash A LOT more then my other one, the longest the PC lasted without crashing was probably around 30-45 minutes. There are no blue screens when the crashes happen.

I used some old parts for this new build, believed that it wouldn't be needed to be upgraded, I had kept my GTX560ti, 650wat Corsair PSU, two hard drives (One an 500gb Hatachi and the other an 1TB Samsung which I found out was broken.)

My build is -
Intel i5 - 3750k @ 3.4ghz, I turned off it's turbo acceleration.
Gigabyte Z77-D3H Intel Z77
Corsair Vengeance Low Profile 8GB DDR3,

And the old parts that were installed are-
MSI GTX560ti Twin Frozr
LG DvD Drive
Corsair Enthusiast Series TX650
500gb Hatachi Sata Drive (I don't use the 1TB hard drive no more because of it being broken.)

I did a memtest on the RAM to see if that was the problem, it crashed. So I took out my graphics card, ran the memtest again with the 8gb installed, but it crashed again. I took out one stick of RAM and ran the test again and then it passed, I then took out the stick that passed the memtest then installed the other one, it passed the memtest again, out of the sake of curiousity I installed the graphics card back into the motherboard with both of the sticks of RAM installed as well and ran the memtest again, it passed the test with both of the sticks of RAM installed.

I was told to send back the RAM anyway, seeing how it was the easiest part to replace and is mostly the problem at times and I've gathered that I doubt it was the RAM and graphics card that were causing the crashes, the only thing I could imagine that is causing the crashes is the power supply or my 500gb hard drive.

I need some help here cuz I'm really left scratching my head and I'm frustrated with this, as you can probably imagine.

The parts aren't overclocked as I don't want to do so yet and the tempertures on my CPU are 38-40 degrees Celsius.

I've been around IT tech stores today, while one of them said they wouldn't be able to help me due to having to much to work on, the other store said that it might possibly be the hard drive.

D: Save me!

[SnOwBunZz]

Does it BSOD or give any other visual error or does it just reboot/lock up?

[Nexoz]

Does it BSOD or give any other visual error or does it just reboot/lock up?

The only bluescreen I got was when I had the 1tb hard drive installed and I was installing windows 7 into the 500gb hard drive, it came out with an Bad_Setup_Info error. After taking out the 1tb hard drive and reinstalling Windows 7 there hasn't been a BSOD since. No visual errors either.

So yea, it just locks up and shuts down.

- Edit, every attempt on doing a hard drive test on both of the hard drives had the PC crash, the 1tb hard drive came across 17 bad sectors but they were remapped, I was told that if a hard drive had more than 5 bad sectors that hard drive was basically done for. I haven't been able to check for any errors on the 500gb hard drive cuz it seems to always crash. The highest I got to was 88% before the PC crashed on me again.

Cute signature by the way.

[SnOwBunZz]

S.M.A.R.T. directly shows the results of your HDD health, so give HDTune (or other HDD testing tools) another try to look for bad sectors.
If it's really bad sectors you'd get errors copying stuff up to the point it won't even detect in the BIOS. I know because it happened last month to me. :|

As for PSU, you'd need a PSU-tester to check for errors. I doubt it's the PSU though unless you always crash under heavy load.

edit: make sure all your cables are connected properly.

[Nexoz]

Sorry for the late post, been busy. >.>

I forgot to mention that when the crashes happen the PC completely locks up, the monitor stays on and the fans still move, obviously there's still going through the PC until it shuts off on it self.

I won't be able to test the power supply as I've sent off the PSU to Corsair to get a replacement, and I've ordered a new hard drive as well. >.< I have no spare power supplies to use as well.

[SnOwBunZz]

Monitor stays on as in keeps getting a signal or?...

Fans keep spinning as long they're powered, doesn't matter if PSU, motherboard or whatever is broke. As long the molex cables work, the fan will work as well.

[Nexoz]

Monitor stays on as in keeps getting a signal or?...

Fans keep spinning as long they're powered, doesn't matter if PSU, motherboard or whatever is broke. As long the molex cables work, the fan will work as well.

It keeps the signal, it'll basically freeze on whatever was on the screen at the time.