Hi and thanks for the add. Hoping someone might be able to assist ease. I have a late 2011 i7 Macbook pro 15 running Yosemite. It froze whilst i was workimg on it showimg vertical grey bars accross the screen for approx 10 secs before rebooting itself to a blank grey screen. If i try to boot to web repair it gets about a 3rd of the way along and then boots again to grey screen. I managed to run hardware diag and it gave me a 4mem/62 error. I removed and cleaned the 2 ram chips (2x 8) but still same. Anybideas please?
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