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Trying to solve computer freezes at random times

Last response: in Motherboards
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September 8, 2009 10:20:12 AM

Hello I have the following box:
CPU: INTEL Q9550
VGA: ASUS RADEON HD4890
MB: ASUS P5Q
RAM: 4GB 800MHZ DDR2 NON-ECC CL5 DIMM KIT
HD: WD CAVIAR GP 500GB SATA2 16MB INTELLIPOW
PS: CORSAIR PSU 650W 12CM FAN ATX PFC 80+
CD: SMG DVDRW 22X BLACK BARE SATA
After few months of perfect running my PC started to freeze at random times. It can be from few min to hours. After freeze I can see last screenshot in the monitor but nothing is responding and some of the PC fans are working faster than before freeze. Sometimes computer freezes during start up even before OS is started to load and even with cold box so I doubt it can be OS problem or heating...
I have checked all contacts inside box.
I have cleanly reinstalled OS to Windows 7.
I have tried launching Windows memory test. If I run standard tests it completes with no errors, but if I run extended tests after running random time computer freezes, everything stops responding. I have 2 memory sticks – have tried to remove one rerun tests – it still freezes, did same with another one still freezes.
I have tried running windows scan disk. During the scan computer freezes at random times too. Sometimes it finish without any errors on smaller disks.
I have checked temperatures. System 40-50C CPU 40-60 GPU 50-70
I have also noticed that after computer freeze and after I restart it – it hangs on initial start – the only thing I can see is dash on my screen. If I restart it again it boots up normally.
The only hardware I have changed in my box is CPU cooler. Change was from stock one to ZALMAN CNPS9500 AT. Everything looks ok with it – temperatures are about 10C lower then with stock cooler.
I would be very thanking if someone would list things that could help me to detect what is causing such freezes of my pc.


September 8, 2009 11:33:05 AM

When you say "have checked temperatures" - is that in the BIOS or inside windows? Definitely sounds like a heat related issue.
September 8, 2009 11:41:34 AM

I have checked both BIOS and inside windows temp with some fan..... tool. Temperatures looked like i said System 40-50C CPU 40-60 GPU 50-70
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September 18, 2009 8:28:24 AM

i have had simular problems the fan quit working in my laptop and thought that was what was causing the problems but after a new fan was installed it still freezes at random i am in process of rebooting for the 5ft time durring a new install of windows cuz of freazing not sure how to solve this problem was wondering if maby the laptop got to hot at one time and now its no good any help would be verry good :) 
September 18, 2009 10:15:57 AM

I still haven't solved my problem i have updated bios and set CPU enhancement margin to Performance, tried different video card ect - no solution yet...
September 18, 2009 12:06:06 PM

If doing all at software level and it haven't solve the problem, it's time to look at the hardware.

Just to share, I assembled a desktop PC before, it's working fine except that it "seldoms" restarts by it's own. It would hang-up on the memory test part, thus I have to restart it manually by physically pressing the restart button. It's only seems a minor problem but pretty bugging especially when installing a new program that requires an autorestart of system. I suspected that the problem is on the MB, I even sent it to the manufacturer but they didn't see any problem at all.

Soon, I experience unexplainable "pixalization" of my display. I couldn't be very sure if the trouble stemmed from the little "problem" about auto restart. Fast forward, I bought new parts including memory, CPU and MB to solve my problems.

If I were you, and if it is still within warranty, do a deductive checking, isolate each part.... this is if you have a "spare" PC, check major parts such as MB, video card, memory and CPU and check if each is working fine.

Hope I could help and good luck on your PC.
September 18, 2009 12:51:52 PM

Check your voltages. In particular your RAM ones. You haven't said what RAM you are running but it may be spec'd at a higher voltage than the standard 1.8v. For example the Corsair Dominators in my gaming rig are spec'd at 2.1v, the Cruicial Ballistix in the other machine are 2.0v. Running them without enough volts could be causing your stability issues.
It could also be your PSU, your mobo or the RAM that are actually defective too. Defective PSUs often cause random lockups or power-downs.
October 5, 2009 4:18:57 PM

What happen to your P.C. man, Any progress?
!