Ive had a Samsung 830 SSD installed in the optical drive area of my 27" iMac. It has been working fine up until the last month or so. Lately, the screen freezes up a little while after I log into my account, or as soon as I log in. It also happened when I logged into the original HD in my iMac. The only time it doesnt freeze up is when I log in as a guest. Ive been on it via guest for an hour now, and its running normally. I just recently got the iMac back from service, in which the screen and graphics card was replaced. When I received it, I removed the optical drive, and re-installed the SSD. Would the SSD be corrupt, and should I re-install ML onto it? I just find it weird that it freezes up after a bit on my account, but runs normally when logged in as a guest. Thoughts?