So I bought a OWC mercury extreme 115gb on May for my 2011 15 inch pro. I installed it in the hdd bay and moved the 500 hdd to optibay. The ssd worked fine for about a month. I had the computer in sleep mode (i closed the lid my self) and it was plugged in. Then when i opened it i got a beach ball and i couldn't do anything else. Tried clicking everywhere but nothing. So I tried rebooting but all I got was a grey screen with NO apple logo. Tired nvram reset, reseated my ram, and everything but no help. Tried reinstalling OSX to see if the disk utility detects the ssd but the macbook would not bootup from the installation cd when the ssd was plugged in, when i unplugged the ssd, it booted up from the installation cd. I tried pressing 'c' and option but no help. So i got a replacement and that worked fine until today. Today, the SAME EXACT thing happened. I dont know what's causing this. Should i get a different brand such a an Intel 320? Need advice and help. Thanks you all.