Until some months later when problems began to arise once more. Computer failed (don't remember if it froze or just went dead) and wouldn't start up again; nothing happened when I pressed the power button, not even lights or fans. So I started removing components, and once I took the RAM out (I have 2 x 1 gig sticks) the power did come on and it beeped to tell me I didn't have any RAM connected. Putting one stick of RAM in fixed everything and got me booted up, so I figured one of my sticks of RAM was fried. Problem is when I tested the other one, it also worked. So I tried both, and the computer worked once, but then failed the next time I tried to boot.
So with lots of experimentation and moving things around, I find the computer will work with one stick but not two. Doesn't matter which stick, nor which of the 4 DIMM slots I put the stick in. It started up with both sticks a couple of times early on, but I haven't been able to get it to do that again.
Bought a brand new 850W Corsair PSU which should have plenty of power for my build, the problem persists. So PSU, mobo and GPU are all quite new and shouldn't be at fault. RAM itself seems very unlikely as either stick works fine alone. Also ran a couple of memory diagnostic programmes suggested by people on this site and they all checked out fine. I tried disconnecting the HD and DVD drive and no effect, so they should be ruled out as well. No other devices attached.
I'm kind of stumped as to where the problem could lie. What would prevent the computer from booting, even having the motherboard power up, when 2 sticks of RAM are connected? I've been operating with 1 stick for quite some time now, as I got so sick of dealing with this and was happy just to have my computer back, but it is slow with only 1Gb of RAM and I'd really like to sort this out once and for all. I've had other bad experiences with the only computer shop in town and would really rather not have to go back to them.
Please help And if I've forgotten to include any pertinent information let me know.
Athlon 64 X2 4600+
MSI K9A2 CF-F Socket AM2+ ATX Motherboard MS-7388
Corsair TX 850 PSU
Corsair XMS2 DDR2 800 RAM (2 x 1Gb, currently 1x)
Radeon HD4870 GPU
WD2500AAJS 250Gb Hard Disk
Lite-on DVD R/W