Problems:
My PC just destroyed my monitor?, and don't know why. I replace the monitor with a new one but suddenly in a week it got destroyed, what might have cause it?
There are two things that can destroy a monitor, your power connector (surge) or your GPU. The CPU has no way of doing anything to the monitor, and typically its other components destroying the cpu, no the other way around
Power connector = Power cord that you plug into your wall outlet (or surge protector)
GPU = Video card - where you connect your monitor to you computer case.
Do you have your monitor plugged in directly to the wall socket? if so that could be the culrpit right there. Most PCs have PSU that can either shut down or at least prevent an electrical surge going further than the PSU itself. Most monitors are not that lucky.
Always use a quality surge protector to connect all your computer (and any electronics in general ).