Since the beginning of today, the time now being midday, I've been having issues with my MacBook Pro. Even when I closed everything it refuses to work. Basically when I close the lid, everything is fine but when I open it the screen just doesn't turn on. The sleep light remains at a single level of light, rather than brightening and dimming over the course of several seconds. If I hold the power button down sometimes it will bring the screen back after what looks like a progress bar and sometimes it will reboot the machine.
If anyone can help me, it'd be much appreciated.