[Solved] Gigabyte MA78GM-US2H not working like it ought to

Hey all

First time poster here.

I built a computer for a friend about 7 months ago. Its been nothing but a pain in the ass. To start with, he had problems with the computer periodically rebooting. It only done it once in a while. I figured maybe it was just windows or some software he was using. After a few months, it became more frequent. Also, he had problems with downloading files and they'd be corrupt. Now, its really slow, reboots, and has the problem with the corrupt files. I've tried a different HDD, different memory, and a whole new motherboard. The HDD I tried was IDE instead of SATA(current HDD is SATA.) My question is this a CPU problem? Or maybe something I'm over looking.

Heres the specs:

SAMSUNG 22X DVD Burner Black SATA Model SH-S223F
AMD Athlon X2 4850e 2.5GHz Socket AM2 45W Dual-Core Processor Model ADH4850DOBOX
Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s
ECS BLACK SERIES A780GM-A AM2+/AM2 AMD 780G HDMI ATX AMD Motherboard (first mobo)
GIGABYTE MA78GM-USH2 (new mobo)
Thermaltake Purepower W0100RU 500W ATX 12V 2.0 Power Supply
G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel

Any help will be greatly appreciated,

Jay

Yep that is about the only thing I haven't tried.. Just didn't think it would cause all that. Of course I had some advice from a friend who "knows alot" about computers. But, you know how that goes lol.

Actually I'm just using some crappy old case. He didn't want to buy a new one. I did monitor the temperatures. The CPU was running on average about 32 C idle and 36-38 under load.

Try breadboarding

It turned out to be some ram, but I had run memtest before and nothing came up. This time though, about 300k in errors lol. Thanks for the help guys.