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Running out of ideas to fix this problem

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Have you tried underclocking and/or loosing up the timings of the ram? Try that first if you haven't.

As for memtest, how did you test the ram modules? one by one or all at the same time? If you already test them one by one at a time, then it's okay. Otherwise you need to retest them, one by one at a time. And how many sticks/ram modules do you have? 2x 4GB or 4x 2GB sticks? If it's 4 sticks you may need to set the northbridge voltage setting a little higher (test with small increments, just to be safe).
 
Try underclocking it (perhaps to stock)? You can do it via ATI Overdrive in the Catalyst Control Center. Reference clocks for HD 7850 are 860 MHz GPU and 1200 MHz VRAM.

The games crash to desktop, correct? The computer isn't restarting itself?

Disable automatic restarting on system failure. Instructions here:
http://pcsupport.about.com/od/windows7/ht/automatic-restart-windows-7.htm

After you do that, instead of restarting, the computer will show a Blue Screen of Death. Take note of the filename (e.g. nv4disp.sys) and the STOP code (e.g. 0x0000000A).
Do both of these.
 
Did you try what I suggested?
 
Sorry - it worked for 3 days fine but it crashed again.

When i turned it back on I got this message on a black screen:

"Checking file system on C
Type of file system is NTFS

One of your disks need to be checked for consistency, you may cancel the disk check but it is strongly recommended that you continue."

It then restarted my computer and all was well again

Could this mean that it has been my hard drive the whole time?

Sorry for slow replies

If this is the case - that it is the hard drive making the crashes happen what we would be a reliable HDD which is good for gaming?
 
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What HDD you have and how old is it? Have you checked the event viewer, it might give you a clue of what caused the crash.
 
Play some games with your side panel door removed to see if heat is an issue. Don't overclock anything.

If that doesn't work try another hard drive.

If that doesn't work could be PSU.

Do all your tests with the case door off though.
 
27.jpg


located here in your bios

dram timing control
 
If he ran memtest overnight with no errors then its not the memory.
 
For Pete's sake, will you report the exact temps of the system and the card?
 
These types of random blue screens signifies problem with RAM or the memory controller. I have these when my system memory section is heavily overclocked and I test stability.
 
I've been reading on some other sites that that doesn't actually do anything...

Did you actually try it or are you looking for ways to avoid a fix when YOU asked for help?
 
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