The ol' 2010 MBP is showing it's age. It won't start up long enough to run diagnostics. Sometimes it freezes and gives the 3 beeps, pause, repeat infinitely (memory?), sometimes it restarts, sometimes it just shuts off, sometimes the screen, touchpad, everything just freezes. It has the capacitor failure in the GPU going on, I bypassed the GPU using the patch last year sometime ( https://forums.macrumors.com/thread...for-kernel-panic-of-macbook-pro-2010.2044304/ ) Trying to clean things up yesterday I did a nvram reset, SMC reset, and ran all apple updates and have lost the gpu patch. I did the csrutil disable in terminal and it said I had to do that in safe mode. I have not pursued that yet. I did try starting in safe mode yesterday and it just gives the start up tone over and over again without going into start up. I think it's time to replace. There is a simply mac Apple partner store in town I may run by and see what they think. I don't really 'need' a pro - but I like the retina display. Looks like on the refurbed ones you can get a oct 2016 13" i7 8gb/512 or a june 117 i5 16gb/512 for the same price (more than I want to spend, but that's a different issue). If it weren't for the lack of a retina display I could live with an air for what I do with it. It has a new (last fall) battery, 8 gb of Crucial memory, and a Samsung EVO 500gb ssd.