I am having a problem with my MacBook Pro. It was working alright this morning, and I left it on while I went to the shops. When I came back, the screen was blank as I'd expect as the screensaver would have kicked in. The computer was plugged into the mains. I wiggled the mouse to wake it up and nothing happened. So I pressed the space bar. Still nothing. So I tried a few other keys. Nothing. I then held down the power key to turn it off, which worked as I heard the disc stop spinning. I tried to restart by pressing the key, and I heard the disc start but no bong noise or anything else. I've tried this a few times now with no luck. I have also tried booting from a DiskWarrior CD and that doesn't work either. Can anyone help me please?