Weird problem with new build

[lumbus]

Almost without exception, *every other* time I turn on the computer, it reboots right after Windows starts loading (as soon as the Windows 7 animation starts). Then Windows asks if I want to start normally etc, and then it crashes again when I continue and so on for ever. If I power the computer off (using the regular front panel button) and then turn it back on, everything works fine.

Once the computer has booted up it's rock solid. I haven't had a single problem in weeks (including Prime95). When it's in its bad state, if I stick a Memtest CD in instead of letting it start loading Windows, the memory tests fail badly.

I have unlocked the two extra cores on the X2, but it's doing this when using just the two cores also. I haven't done any overclocking yet, or messed with the memory timings (the memory is current running with the default settings 1333 MHz unganged, not sure about exact timings).

Any ideas??

MB: GIGABYTE GA-MA790GPT-UD3H
CPU: AMD Phenom II X2 550
Mem: G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 F3-12800CL9D-4GBRL
PSU: CORSAIR CMPSU-400CX 400W
HD: Western Digital Caviar Black WD7501AALS 750GB
Optical: LG 22X DVD Burner GH22LS50
Gfx: Using onboard gfx for now

Thanks!!

 

[Grimhammer82]

I am researching a similar build and I've read in a few places the Ripjaws have some issues with AMD that may be timing related. Just throwing it out there.

I'll be curious to see how this turns out.

 

[lumbus]

Thanks, Grimhammer... At this point I wish I had picked some memory off Gigabyte's compatibility list, but it was kind of limiting (as usual). G-Skill's site said this would be an ok match, but I'm not sure what that's based on, exactly. Of course, it could be something completely different.