MY Mid 2010 MBP has been useless since installing Elcapitan. It crashes 5 times daily. Screen goes black and then a gray square comes up telling me to restart. I've researched, cleaned the computer, unloaded all nefarious software (mac keeper etc), cleaned off all old unused software. Today I installed Sierra on an external SSD, migrated my data and booted from there. And......it still quits. I am hesitant to buy a new mac because I'm afraid that once I migrate my data and apps it will still have this issue. Why is no help forthcoming from Apple on this issue? The cynic in me thinks they are trying to force up to buy new machines but I see that some people with newer machines have this problem. Generally tis only happens when using my browser (chrome worse, Safari a little better but still crashes) but now it's happening using Affinity designer too.