My 5 year old iMac (i7, 16 GB RAM, OS Yosemite) suddenly shut down and "rebooted" - but only gives me a blank black (not grey) screen. I can hear the re-boot chime and hear the hard drive running, but that's it.
I've tried resetting SMC, tried restarting in recovery mode - no luck.
Then I tried resetting PRAM and voila it worked - for a couple of hours. Then it shut down spontaneously and rebooted to nothingness. This time resetting PRAM doesn't work.
Any idea what the problem is? I don't want to take it in for a repair if the likely problem is expensive to fix, but would take it in if it's only a couple of hundred dollars.
I know I'm due for a new desktop, but it'd be great if I could wait for Skylake chips.
Thanks for any suggestions...
Bob
(BTW - fortunately I had full backup. While desktop is down I'm using my 12" MacBook for everything crucial, and have been pleasantly surprised at how well it performs.
I've tried resetting SMC, tried restarting in recovery mode - no luck.
Then I tried resetting PRAM and voila it worked - for a couple of hours. Then it shut down spontaneously and rebooted to nothingness. This time resetting PRAM doesn't work.
Any idea what the problem is? I don't want to take it in for a repair if the likely problem is expensive to fix, but would take it in if it's only a couple of hundred dollars.
I know I'm due for a new desktop, but it'd be great if I could wait for Skylake chips.
Thanks for any suggestions...
Bob
(BTW - fortunately I had full backup. While desktop is down I'm using my 12" MacBook for everything crucial, and have been pleasantly surprised at how well it performs.