if i turned it off, then on again, for a minute, it works. if i restart using the start menu it works. if i shut down, leave it alone, then it dosent start up. before i reset the cmos, it powers on, but the screen acts like the computers off. if i disconnect the monitor, it will say something like, not connected to computer, so it still detects the computer there. also, theres no windows start up tone or anything, i just hear the hard drive spin and the fans turn on, thats it. recently, i replaced the flat 3V battery on the motherboard itself, thinking that the battery wasn't storing the saved CMOS data when the computer was off. so far so good, but havnt tried turning it off for a long period of time.