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[QUOTE="blacklagoon, post: 14176176, member: 119414"] A week ago my CPU started doing something strange. It runs at 100% usage, all 4 cores, even at desktop with no applications running, but only if task manager (or process explorer, or anything that monitors each individual process's CPU usage) is not open. It's almost like something hoards the CPU and then immediately hides when task manager tries to look at it. Measured in Speedfan, which does not affect the usage like task manager does, the usage immediately shoots up to 100% the moment task manager is closed, and the core temp spikes very quickly (but the fan speeds do not change). It doesn't happen in safe mode, however. I have run a Malwarebytes Anti-Malware full scan and have tried closing almost every process and service, but the problem persists. Maybe a driver problem? My CPU is an AMD Athlon II X4 640 3.0GHz. [/QUOTE]