Try using a different monitor cord, or changing monitors. You need to figure out if it's the PC or the Monitor that has gone bad.
try starting the machine in safe mode...Turn the PC completely off then after you turn it on, keep pressing the F8 key (tapping it) and see if an advanced menu will pop up. Making sure that it's not something in your startup that is corrupt. If it starts fine then, you should run a program to see if you might have a virus...I use Malwarebytes...it's free and usually finds malicious activity on your PC.
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ermm this problem happend before and it wasnt monitor maybe the computer is fried?? because it was broken for like a few months and my friend tried to fix it he turned it on and it worked so maybe i have to keep it off??
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