System locking up randomly

Replaced the motherboard, put the old PSU back in, and I've only had one lockup since. I'm not sure if that was an anomoly, so I've left it idling overnight without any problems and haven't experienced any since.

I'll keep you posted on whether it actually stays working or not!
 
Lockups became frequent once again, but didn't happen in safe mode.

I played with drivers for hours including just putting in the ones that've always worked straight off the CD. Same lockups.

I bought a new graphics card, installed it, put on the standard mobo drivers and the standard graphics card driver, and haven't experienced a lockup since.

How much of the responsibility could be apportioned to the motherboard and how much to the graphics card I'm not sure, but they were both cumulatively responsible for the fault. It all just died on its arse within a day!

Still, fixed now.

Thanks very much for all your suggestions! :)
 
id say its your memory. i have a nf7-s v2 board here and its still running solid with no issues. nforce2 boards are very picky with ram especially when in dual channel mode.

your method of testing the ram is a joke. pulling out 1 stick then booting up is not a test.
you need to download a ram testing program, goldmemory is the one i use for nforce2 setups since i find it can find errors faster than memtest86+ can.

download a trial version of goldmemory or if you prefer memtest get that and giev the ram a thorough test.

as for hard drive testing use hdtune to do a full error scan and check the smart report in it.

also what temps does your cpu run at?
 
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