I tried to upgrade from Window 7 to Windows 10 in January; my computer has been in sleep mode ever since. There is NOTHING on the screen, (no cursor or anything) and the hard drive light just keeps pulsing. I can turn it off by pushing and holding the power button, but when I restart it, it does not go though a reboot...it is still in hibernation, like it hadn't even BEEN turned off. So I am unable to boot from any drive. It is stuck in sleep mode! The computer is a Gateway DX4540 - UBC01A.