i have a very interesting problem thats getting to me. i have an HP Desktop PC Pavilion 500-c60, running on windows 10. i booted it up and logged in, and went to do something for about 30 minutes. when i got back, the monitor was black (i assumed it was in sleep mode). i tried to wake it up by pressing buttons and wiggling my mouse, nothing worked. the power button did not shut the pc off, so i pulled the plug. when i try to turn it on, hard drive powers up, fans spin, and everything seems okay except it wont post. things ive tried: resetting the cmos, reseating the ram, disconnecting everything except mouse/keyboard, a different monitor, and turning off the system and draining of power. nothing works. holding the power button does not turn it off either, and the LED in the power button does not turn on.