Working OS Suddenly Won't Load (four Blue Squares Then Reboot)

Nov 6, 2015

I've had some fun and games with Windows 10 so far (Solved Windows 10 upgrade - random freezes and PC becomes unresponsive - Windows 10 Forums). Now something else seems to have gone wrong.

I was fiddling around with the BIOS last night (trying to get the PC to see 8GB rather than my current 6GB of memory). Anyway, I couldn't, so I switched all the BIOS settings back to what they were (even did a CMOS reset). However, I now find that my PC won't boot into Windows 10. It crashes/reboots as soon as the four blue squares appear on screen (usually before the little dots even have time to rotate).

I can't boot into Safe Mode. Inserting a Windows 10 DVD also falls over. Even the Macrium Reflect boot disc I have won't work. However - mine is a dual boot machine - it will boot into Windows 7 without a hitch.

I've tried using the BoYans.net Dual-boot Repair tool, but no no avail. Ditto Tenorshare Windows Boot Genius - though it does at least boot, but none of the tools within it have made any difference (I've tried Boot File Recovery and MBR Recovery - I didn't run Boot Sector Recovery, as it mentions making "All boot sectors of this partition... compatible with Windows Vista and Windows 7".)

Can it possibly be something weird in the BIOS - even though I've reset it on more than one occasion? Or is it, as I suspect, some weird boot problem (again!) - both the above tools can see the Windows 10 installation, so I know it's still there in theory.

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