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try hooking it up to an external monitor using a VGA cable. If you see something on the external monitor, then it's the screen that's bad, if you still see nothing, then it's more than likely the video card.
boot frozen you may try
1) change RAM memmory or change the memories slot between one and another
2) check cpu fan works when booting
3) clean the dirty stuff through the way of cpu fan
if not fix, your motherboard hardware need to repair by the specialist
Have you tried hooking an external monitor to the system? If that works you may have accidently switched the screen to an outside monitor. Or you could have a bad connection. Try starting in safe mode and see if it works.
This is such a user error. I had the same problem on my 3100-1718. It was as simple as holding down the Fn key and using the left and right arrow keys to change the brightness... I am a goofball for ever letting this stay dark for a month !