Playstation 3 console stopped working...i turn it on and the screen is frozen.why?

May be...

I bought it and was working ok for 1 month,and occasionally it would freeze,and had to be restarted..but one day it just failed almost everytime I turned it on..i checked the cables,even replaced the usb for the controller, i tried a different game,nothing helped...could've been a virus in a preowned cd(game) infected the hard disk?...

i dont think there couldve been a virus in a used game, but you never know. call sony and tell them your problem. your ps3 has a one year warranty on it, you will probably have to send it into them so they can fix it. it takes like 3-4 weeks for them to get it done. i had to send mine in. there number's 18003457669 in the U.S. if they cant fix it then they send you a refurbished one

Is ur system update this usually happen if the system is not updated u should have update 2.52 on ur system. If u have the update u should check the ventilation of the system make sure its dust free use a vacuum and and suck the dust out, also make sure ur system is not enclose in a compact area it should be in an open area so it can stay cool.