Last night Mr H's MBP shut down on its own when it was just sitting there and hadn't been used for a while.
It felt warm, when he noticed it - probably soon after it occurred.
He couldn't get it to boot up - nothing happened, so he took out the battery.
The battery did not feel hot but the MBP continued to felt quite warm.
He reinstalled the battery and it started up when he pressed the power button.
Today, when he went to turn it on, the progress hung up at about 60%.
He turned it off with the power button and waited a minute.
Tried again, it booted OK, but staring at the progress bar we noticed it became a white rectangle the size of the bar for a flash of a second.
I remembered what you - MonkeyBoy - said here:
https://x704.net/bbs/viewtopic.php?f=12&t=8180 MonkeyBoy wrote:
...
Then try opening up Console in Utilities and see if it's repeating errors about disk0s0 or disk0s2 or something along those lines. Depending on what it says it could be a clear indication the disk is on its way out (though it could also be severely corrupt). You should be able to type disk in the search field in the upper right and it should only show you entries that contain the word "disk" although it may take a little bit to show. I would wait on this until your files are backed up.
What it sounds like is that its having some issue with the HD. Starting up off bootable installation media, then loading Disk Utility, then trying to verify Macintosh HD would be a good step. You can't repair the HD if you're booted off it, though you can verify it, although if the HD is suspect you're best doing it from different media. Note that Disk Utility looks very different in 10.11, most everything is there its just been moved around or turned into a button.
so we did the console thing.
We got nothing for disk0s0, but this for disk0s2 - what to do next???
I will drag and drop recent files but am taking your advice and not doing an HD backup in case everything fails in the midst.
Should I boot from my USB of El Cap and follow your above direction next?
Thanks in advance!
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