Hello, I installed a Crucial M4 128GB SSD into my 2011 iMac 27' yesterday. At first everything seemed fine. I formatted the SSD in Lion. But later when I started the computer again, Apple logo and a progress bar showed. Before it finished, the computer shut down itself. I've tried resetting PRAM and SMC, no luck. I tried to use internet recovery. The rotating globe showed and a few seconds later, it shut down again. Now my iMac won't turn on when I press the power button. Unplug the power cable doesn't help either. Did I mess with the hardware? Or is it software related? Any comments or suggestions are welcome. Thanks!