I haven't used my PC in a week. Today I turned it on and wqs getting no signal to my monitor. I checked all the cables and still nothing. I tries to power my pc down by holding the power button and nothing happened. For 5-10sec, 30sec, didn't make a difference. I noticed my mouse lights up when the PC is on, but not the keyboard. I bought this primarily for gaming. Have done literally nothing else. No remotely sketchy websites or anything. No idea where to start with this. I have basic computer knowledge. My brother helped me order it. Specs in the picture. Please help me!