About 5 days ago, I started getting random shutdowns. It isn't really going through a shutdown sequence I don't think, as there is no "dial". The screen goes dark, but there is still a glow to the screen. The keyboard light stays on for maybe 10 seconds, and then the computer turns off. When using the battery, it seems to happen more often, but it doesn't always happen when using the battery. Seemed to happen a lot around 60-70% battery. Sometimes it happens at 100% battery, plugged in or not plugged in to the original Apple recharger. Everything looks fine in coconutBattery. Sometimes it happens once every hour, sometimes it won't even let me log in. Temperatures look fine using Hardware Monitor. I was able to discharge the battery twice to 0% using Safe Mode. Sorry I don't remember if Safe Mode completely fixes this problem... seems I had a couple shutdowns while using Safe Mode too, but I can't really remember. So I'll try it again in not-safe-mode after I get it to 100%, but I'm not optimistic that the problem will be fixed. It seems I was reading solutions that maybe don't apply to my particular MBP. So to recap, this is what I've done:
1. erased hard drive, reinstalled OS X, updated completely
2. reset NVram/pram and reset SMC through various methods, including the official method (10 second hold with charger unplugged), and including disconnecting battery and holding power button for 2 full minutes.
3. discharged battery to 1% twice using Safe Mode.
4. ran D diagnostics at startup, it found no problems
I am trying to meet deadlines for my Master's Thesis, which is why I'm posting this now, instead of waiting until after my Apple Store appointment, or waiting until after my battery cycle experiment. I'm not optimistic that either of these will be the solution that works. I'm not replacing the logic board! I'll much sooner sell this thing for parts on eBay and buy another lightly used one. Mine has seen very heavy use for 3 years. But I'd rather just fix it!
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=== Update (07/21/2017) ===
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Oh, one more thing... when I log in to my administrator account, the screen flashes with horizontal white bars covering about 25% of the screen. This seems quite odd to me.
About 5 days ago, I started getting random shutdowns. It isn't really going through a shutdown sequence I don't think, as there is no "dial". The screen goes dark, but there is still a glow to the screen. The keyboard light stays on for maybe 10 seconds, and then the computer turns off. When using the battery, it seems to happen more often, but it doesn't always happen when using the battery. Seemed to happen a lot around 60-70% battery. Sometimes it happens at 100% battery, plugged in or not plugged in to the original Apple recharger. Everything looks fine in coconutBattery. Sometimes it happens once every hour, sometimes it won't even let me log in. Temperatures look fine using Hardware Monitor. I was able to discharge the battery twice to 0% using Safe Mode. Sorry I don't remember if Safe Mode completely fixes this problem... seems I had a couple shutdowns while using Safe Mode too, but I can't really remember. So I'll try it again in not-safe-mode after I get it to 100%, but I'm not optimistic that the problem will be fixed. It seems I was reading solutions that maybe don't apply to my particular MBP. So to recap, this is what I've done:
1. erased hard drive, reinstalled OS X, updated completely
2. reset NVram/pram and reset SMC through various methods, including the official method (10 second hold with charger unplugged), and including disconnecting battery and holding power button for 2 full minutes.
3. discharged battery to 1% twice using Safe Mode.
4. ran D diagnostics at startup, it found no problems
I am trying to meet deadlines for my Master's Thesis, which is why I'm posting this now, instead of waiting until after my Apple Store appointment, or waiting until after my battery cycle experiment. I'm not optimistic that either of these will be the solution that works. I'm not replacing the logic board! I'll much sooner sell this thing for parts on eBay and buy another lightly used one. Mine has seen very heavy use for 3 years. But I'd rather just fix it!