I have cleared the cmos and loaded optimised settings but this has made no difference. Thinking it was a corrupted driver I have restored the system from a known good back up but that resulted in the return of the no boot/display problem. Even though the graphics driver is disabled and I do not have a separate Graphics card, dxdiag shows Microsoft Basic Display as the driver even though windows is displaying at 1080p. Error code: 0xc0000225' I managed to boot into safe mode, disable the graphics driver and then reboot the system. Eventually after receiving "A required device isn't connected or can't be accessed. On reboot the system got through the BIOS but would not boot/display. Is it possible to damage the Intel Integrated Graphics (HD4600) by overclocking? I attempted to do this using Intel Extreme Tuning (don't ask) via frequency only not voltage I believe, and the PC locked up after the third increase. Intel Core i7-4790K overclocked to 4600 MHz 1.2789 V
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