Hi all we are having a problem with our macbook pro on which we do all our photo editing... I was hoping that someone on site here may be able to suggest something other than what we have tried. The problem started when I was editing pics on lightroom, I was pushing through with the edits and in a fairly warm room, the computer just crashed and I thought I may have over heated it so let it cool down and although it has restarted a few times since it keeps on crashing and ending up with either the white screen of death or the black equivalent. We are running El Capitan on a late 2011 15"macbook pro 2.7mhz intel quad core processor, 16 gig ram and 1gig radeon graphics. We have ran the apple hardware test and it says all is OK, we have erased the disc and done a complete reinstall of el capitan and although it booted up after the reinstall it crashed again as I started using Lr again. I would appreciate any suggestions you may have.