Cpu not running at full speed

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I only had Windows 7 64-bit at the time and one day when trying to wake the PC from 'sleep' the CPU fan came on full with nothing displaying on the screen, so I had to turn it off using the button on the front.

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RAM: Crucial 2x4GB (8GB), DDR3, 240 PIN, PC3Ī few years ago (2015 roughly) everything worked fine. OS: Dual boot with Linux Mint 17.1 and Windows 7 64bitĬPU: Dual Core 2.5GHz Intel Celeron Processor G540

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I've had this problem for a few years and just dealt with it as it hadn't been crucial to my PC use, but it seems to be getting worse and locks me out from time to time now.