Ok, so my E8600 refused to boot up a few days ago. It was running perfectly fine, Prime95 for 12+hours. I stopped the test, shut down the PC to change some hardwares and gone... It refused to boot up on my mobo. My Abit IP35 Pro is still working fine, now running a P4. I also tested with a E7200. So it can't be the mainboard... Of course, I tested it E8600 on many different mainboards. Here's the list: Abit IP35 Pro (P35): fail Abit AW9D (i975x): fail Asus P5B Deluxe (P965): OK Asus P5K EPU (P35): OK DFI Lanparty DK P45-T2RS7 (P45): OK Biostar dunnowat (G31): OK Both the Abit mainboards are running fine with all other processors I tested, except this E8600 All mainboards run 45nm processors fine in case you are wondering. The E8600 is running fine on my friend's P5K EPU as I'm posting this... it's even overclocked using stock cooling. It also went through a benchmark session when I was at Adrian's place to test it on his Asus P5B. All I can say is: WTF?