So my laptop became unresponsive after sleeping over night. The led light was on but the screen was black and my bluetooth keyboard was not responding. I had to complete a hard reboot (holding down the power button for a long time) and subsequently all my work I had not previously saved was lost. This is the second time this has happened (both after the firmware update to SATA 3.0). I looked online and solution was to reset PRAM but I've already done that at least once or twice. I was initially thinking maybe it was one of my peripherals but I never had a sleep/wake issue on my old unibody aluminum mac 2.0. It's the same setup. Does anyone have any other suggestions, tips and experience with the issue? Is this hardware related and if so should I exchange my laptop?