Samsung Galaxy P1000 stuck on black screen
Try charging the Tab for an hour or so.
Connect the Tab to the computer via usb, so that you hear it bleep and appear connected.
Hold the power button on the Tab down for 10 secs.
Remove usb from Tab.
Wait 5 escs.
Try power on.
I had a similar problem and this worked for me. I think the Tab has a battery discharge issue and turns off the display which does not come back up