I upgraded to Lion on my MacBook Pro. This morning I switched on and got a grey screen which I guess means it's crashed. I am very untechnical, but any advice on potential fixes would be very welcome. Please help!.
The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot into Recovery by holding down the key combination command-R at the chime. If your startup volume is encrypted with FileVault, you’ll have to unlock it in Disk Utility before you can do anything with it.