So.. i read about similar problems here, but no one exactly like this. It started out like the classic "black screen, wont boot, but hard drive running" however i could start it with reset, hold down alt, cmd, p, r,. and it would run fine. But now it wont start at all. It makes a starting noise for about a second, then makes the force quit noice and shuts down. if i hold the power button down for a few seconds it tries to start up, but then dies after holding for 5-6 seconds. another thing, when i try removing the battery and run only the power chord. NOTHING happens when i push the power button. when plugged in the battery is charging like normal, and the power chord is lit orange. iv done ALL possible resets. could it be the battery? harddrive? I know the power suply works, tested it on girfriends macbook. im quite desperate as this is my work computer, and not everything is backed up at the moment... thanx for any reply.