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Windows 10 starts, then quits running. Help?
So, I upgraded from Windows 7 to Windows 10, and the installation went smoothly. Everything worked, it installed fine, and then it restarted for the, or at least what I assumed to be, the last time. When my PC turned back on, it ran just fine, went to the boot screen [Windows logo at top center, loading circle at bottom]. Then, after a few seconds, my screen flashed black for a second, then turned back on. It kept loading, then it froze and then the monitor turned off and gave me the [POWER SAVING MODE] screen. But the most weird thing is that the computer itself never turned off. The fans kept running, it never shut down. It would also not respond to the power button to shut it down. The only way to "turn it off" is to switch the power supply off. But also, very odd, at least with my limited experience, was when the power supply was turned back on, the computer didn't immediately start up. I had to manually turn it back on, and it did the exact same thing.
I have no idea what is going on, and I would really like some help.
Thanks!