Hi all, *IN A NUTSHELL* 2012 non retina MBP is experiencing kernel panics kernel_task using up 300%+ CPU have tried multiple 'fixes' (see below) I've always experienced issues with kernel_task on my MBP (mid-2012 9,2) since I upgraded the RAM and Optibayed it. Since then I have took it to an Apple store and had a Genius take a look at it - everything came back as fine and working properly. As some of you will know, the kernel_task issue sucks up 300-400% CPU and causes the fans to run at full speed 24/7. Not only does this result in a painfully slow/unusable Mac, it actually makes a pretty horrific noise. This time around, it's happened at the worst possible time. I'm a DJ and have a gig this saturday so no MBP means no gig with in turn means no money to get MBP fixed. Here's what I've tried so far: Reset PRAM Reset SMC Done a clean install of Mountain Lion (through Internet Recovery, I was running the latest public release of Yosemite - 10.10.3) Ran a terminal command which moves the SMC kext out of a kext bundle into my home folder All of the above have work for me in the past just not in any particular order. I haven't got any peripherals connected to my Mac. Since Resetting PRAM and SMC, my keyboard backlighting has stopped working and System Preferences doesn't have a backlighting section in the keyboard menu. Please don't give me the usual "Oh it's the upgrades that you did which are causing kernel panics" because since they have started happening, I have replaced all of the original hardware back into my mac (including the superdrive) and I still get kernel panics. Sorry for the rather wordy post but I thought details might be important in finally getting to the bottom of this really annoying issue. Thanks in advance for any help.