system unit power on

So this is something I just want to know. Basically I had this setup of four years broke off overnight last Friday. I was literally using it the night before, now I shutted it down no problems, but what I usually do is I'm lazy to turn off the avr before going to sleep, which means there's still...

Hi Guys, In my Desktop, Monitor is ON (LED lights up) , System Unit ON (LED powers up) But there is nothing on Monitor screen.(Data cable is plugged) When I plugged in a working Mouse it lights up first and gets OFF. What seems to be the problem guys ?