EDIT: Fixed with the 10.9.4 update Yesterday my Mid '12 rMBP froze up on me. First time it had frozen up on me since I bought it new in '12. I thought it was odd. Forced it to shut down and then restarted it. Looked for an update and saw that there was one I missed. I updated to 10.9.3 and I see this now when I start the computer. Very short video https://www.dropbox.com/sc/fsp8x4e4vzmcha3/AADT3DARAtZbrEcQcOaOpE0ba That green and purple logo has me worried. Is that the GPU screwing up or is that related to my update? I don't visually see any other glitches except that. What advice do you have or is there something I can do to check on this? Thanks for any help that you can give me.