Hello guys, new member here! Registered myself because I hope someone here can help me with what happened. I have a mid 2011 iMac 21". I've been using yosemite since the end of last year (november maybe) without any issues, besides some lag that I thought it was the system wanting more memory. I did every update released until now. I never turned my mac off, only did that when I was going to be out for more than a week. It always woke up fine until this monday. I hit a key and it wouldn't wake up. Clicked the mouse and nothing. Pressed the power button and it woke up. My wired keyboard and mouse were irresponsive. Bluetooth trackpad also dead. After a long research (and looks like a lot of people are having this issue), trying numerous things and spending some time on the phone with the support, nothing worked. Here's what I tried so far: - turned on and off a lot, with the keyboard and mouse plugged, or plugging them when the mac reached login screen; - removed power cable, waited some time, turned it on, with cables plugged or plugging at login screen; - connected keyboard and mouse to another computer, they work fine, but not on my imac; - tried a generic keyboard, still nothing; - connected some usb device (card reader, pendrive, external hd) on my keyboard usb slot; - connected my keyboard and mouse through an extension cord and/or powered usb hub; And maybe I've tried some stuff that I don't remember, the thing is the keyboard and mouse don't work. Other details that may help diagnosis: - the light on the mouse (generic, optical) don't turn on; - if I plug a card reader or external hd or usb hub on the mac usb port they light up; - plugging my ipad on the usb slot on mac doesn't charge; - the mac charges a small bluetooth speaker. Apple care expired in the end of last year, but the biggest problem is that I don't have an authorized apple repair near me. The only thing I want is to put the keyboard to work for a little time, enough to factory reset it an go back to lion. Or if anyone knows how to do this without a keyboard... Hope someone can give me some light! Looks like apple really screwed it up with this release... ---------- Btw, I can't reset pram because keyboard doesn't work.