Very weird. I've had it since may 2016, 1.3 GHz/512/8 with the latest Sierra 10.10.2 update. Was working perfectly until about 30 minutes ago when I opened the lid and just got a black screen with the cursor. Nothing else. Tried rebooting x 2, when through the entire boot sequence and then back to the black screen with the cursor. Tried safe mode, got to the log in screen, logged in, got to the black screen with cursor. Booted again, now no boot sound, got to the black screen with cursor. Finally, did a SMC reset. Now the computer does not even start. Nothing. A brick. In retrospect over the past 2-3 months I recall weird things like no sound on certain videos, slow return from sleep when lifting the lid, etc. Software? hardware? Anyone else out there with this issue?