Had a very brief power outage (almost instant off and right back on). Ever since, our iMAC won't boot beyond a white screen with a folder (and it was plugged into a surge protector!). I've tried every method I can find and I can't get it to do anything - won't go into recovery mode (and it's so old, it won't do the internet version either) - I've reset all kinds of things - tried the unplug, count to 15 and then plug back in with the power button held down, CMD-R, OPTION-CMD-R-P - nope. Seriously, I've looked at a ton of things and tried them all. Once, I actually got a mouse pointer - wow! Never since, though. I can hear it trying to boot but it never gets beyond the white screen/folder stage. I don't have anything (NOTHING!) that I can use to restore the OS and I can't tell you what the OS was other than "X" - it's my hubby's MAC and he's more clueless than I. I was in IT for 30 years working with Microsoft OS so I'm no slouch when it comes to tracking down solutions. But, this time, I give up. Before I make a call to Apple, thought I'd try this forum. Thanks for any help you may offer - sure hope there's something I haven't tried but I'm not too hopeful. Oh - I did set up an external drive for TimeMachine backups, in case that helps.