1468 Views 1 Reply Latest reply: Mar 5, 2011 5:44 PM by WZZZ
Try an SMC Reset. Shutdown, unplug the computer, press and hold the power switch in for five seconds, connect to power and restart.
If you can get it to boot and respond to the keyboard, then repair the disk using Disk Utility. See "Try Disk Utility" or do a Safe Boot.