Hi!, I've been having intermittent problems with my rig for the past six months, and I'm at my wits end, I would really appreciate any light you guys could shed on the subject. My specs are as follows; Win 7 Ultimate x64 Intel Core 2 Quad Q9550 2.83ghz Asus p5q pro motherboard 8 gb of Corsair ddr2 (4x2gb) (CM2X2048-6400C5) Ati Radeon HD 4800 1gb Basically whenever I fire up any 3d game that is even slightly demanding on my system, I'm able to play for 10-15 minutes when my system suddenly hangs to a black screen, the lights stay on, and the system is still powered up, but there is no output to my monitor, I have no choice but to reboot my system every time this happens, and upon returning to Windows, I'm greeted by a prompt telling me there was a serious error. So far I've eliminated the PSU/GPU by swapping them both out with extras I had laying around. I've attached the five most recent minidumps, and I've also had a peek in the event manager and apart from the Kernel Power errors there are a ton of "WHEA-Logger" errors that coincide with all of the crashes "Event 18 A fatal hardware error has occurred. Reported by component: Processor Core Error Source: Machine Check Exception Error Type: Bus/Interconnect Error Processor ID: 3 The details view of this entry contains further information." I'm completely out of my depth as far as minidumps and event manager logs go, but does this mean it's primarily a cpu issue?. Anyway, I appreciate any help you guys can offer, let me know if there's anything else I need to do. *Edit* My gfx card drivers are fully updated.