thanks for your replays
its not a new power supply and not a new windows
suddenly the PC shuts down and its never work
the cpu fan spins and the power supply's fan spins and i opened and closed the CD room and it works... but the monitor remains black and displays nothing,
and there is no voices that tells me that the case is booting and the operating system is working properly...
just the sounds of the fans and the monitor is black...
can u help me please??