Customer's problem originally started with the graphics issue. I am a tech and just came across this problem. I wonder if we're finding a new problem with the Mid 2012 computer.

Then it has BANK 1/DIMM0 and basically says the same thing This is what it says under SYSTEM INFORMATION Hardware>Memory.Memory Slots: I have done so much research on this issue here is what I have found thus far, obviously the ram issue, A GPU issue, A logic board issue (lets pray its not), a battery issue or a issue with Mavericks. I am currently using it in 'safe boot' mode and I turned the SMS (sudden motion sensor) off. Here is just some details and extra info about what I've tried and researched: I am in nursing school and my computer is vital PLEASE someone help me!!!! Sometimes when I scroll on safari, chrome or anywhere (when its working) the screen glitches and lags really bad. my computer has passed every hardware test imaginable. I have had the Ram replaced TWICE and have had the ram readjusted in case it has fallen out of place. It works fine and then all the sudden it glitches and shuts down. I'm currently using it right now and it seems to be okay but this is always the case. Sometimes It beeps 3 times (what everyone claims is a ram issue) and sometimes it does not beep and will just start right back up again. My Macbook pro has been having screen glitches randomly with lines appearing on the screen and then it suddenly shuts down.

Mid 2012 macbook pro 3 beeps