When waking my computer it won't come back up from black. Force the computer to shut down, and when I try restarting it, it will flash white and then won't boot up. Tried resetting PRAM and SMC, doesn't fix it. Tried booting into recovery or diagnostics, nothing will boot. This happens frequently, eventually it will work again, how can I get it to boot, and is there a way to fix it so it won't happen any more?
MacBook Pro, OS X Mountain Lion (10.8.4)
Start up in Safe Mode. 10.7 / 10.8
http://support.apple.com/kb/PH4373
Repair Disk
Steps 2 through 8
http://support.apple.com/kb/PH5836
Best.
Can't boot into safe mode, as I've said, it won't boot period (as in, into any mode).
You have to take the computer to the Apple store to have it checked out.
http://support.apple.com/kb/TS1365
Best.
A lot of the advice given both by Apple Support and this Community about intermittent start-up problems and crashes relates to repairing the system by using various actions during start-up. This may help many, but despite folowing these instructions, my mac's problem persisted. Eventually, I realised that the problem had started after I downloaded Google Earth. So I uninstalled Google Earth and the heavenly choirs started singing the Hallelujah Chorus. The computer now seems back to normal. I'm sure this won't help everyone, but it might be worth checking if your computer's issue started after a corrupted download or update. I have also found Disk Utility - Repair Disk extremely helpful for performance glitches.
Try Recovery from the internet:
start up while holding CMD+R+Alt(option).
Obviously you need an internet connection for that.
Then repair disk.
(bet it may also be your Ram, did you change ram?)
Won't boot
