Hi, This BSOD is really twisting my melon! I built a new pc about 4 weeks ago now and it hasn't been stable since. Pentium D 915 2.8Ghz Asus P5B-E (and now P5W DH) 2x 1GB Elpida DDR2 RAM Asus x1650 graphics 512MB (now powercolor x1950 256MB) 2x WD2500YS AHCI mode Not Overclocked I have tried clean installs of winxpsp2 and vista. I've swapped motherboards and graphics cards too. Interesting to note that the problem went away for about a week after i swapped out the graphics card, so i thought it might have been dodgy. But now the problem is back with avengence! I have tried disabling most thnigs in the BIOS of both motherboards including sound and LAN. Have also tried giving the CPU and RAM a little more juice. I have run memtestx86 all day without errors. I have run prim95 and 3dmark all day fine too. It's so random in that it will do it very often for a while, then will go away for a bit. Today I've had to have 3 go's at writing this new thread! I will attach a couple of WinDBG analysis files. Let me know if anyone needs anything else? I'm hoping someone can get some idea of what these minidumps are telling me? To me they look kinda random. Although I have seen the win32k.sys one a few times I know - obvisouly these 4 dumps are 4 of about 60 that I have had in total I would guess.