Hi All, I am having fits trying to figure out why my computer is randomly going into bluescreens. I have done a chkdsk /f/r (no errors), I have done 7 hours of memtest86+ (no errors) I have swapped out my GeForce 9500GT graphics card with my onboard Nvidia 7025 graphics chip (BSOD's on either), I have updated all the drivers from my motherboards website (BSOD's before and after), I have re-formatted and re- installed and fully updated, (including SP1) my Windows 7 64bit (BSOD's continued). I have checked all the connections inside and made sure it is not all covered in dust. I have checked that it isn't overheating. I am running out of ideas what to do, to find out what is causing me this nightmare. I have defragged. I have switched my usb mouse for a PS/2 one (BSOD's continued). It crashes at various times and the errors it gives have been changing from this to that, and really haven't given me much idea as to what is the cause. I am at wits end because it isn't that old for a computer, I have only had it for ~ a year. I really don't want to go out paying for new parts (PSU, Motherboard) without have at least some sense of knowing what is the cause. I can be reading email, or just starting it up and trying to open a folder when it crashes, it could be anything, it seems, that I do, when it decides to go bluescreen. I am running an AMD Phenom II 955 on an M4N68T-M-ASUS motherboard. I have 2X2 Kingston KVR 133303N9/2G 1.5v Ram and 2 western digital 500 gig hdds, one SATA, one IDE, running in master/slave config. I am running Microsoft Security Essentials that is up to date and also have scanned my system prior to sending this and came back clean. If anyone has some advice or can offer any help I would be very much appreciating the sage from you guys.