No longer turned on, then mysteriously it did! Any ideas why??

So one day my MBP was working fine, it had about 70% charge left. I closed the lid and went upstairs, opened the lid again and it didn't come back on. I tried the power button, still nothing. There was no backlight on the screen, no sounds, nothing. The power cord light still came on when plugged in and the battery indicator still worked, indicating i still had the ~70% charge.
The only other clue I have, which could help diagnose what happened, is that i tried turning on the caps lock button to see if that light would come on. With the bedroom lights turned off, i pressed the power button and saw caps lock briefly light up! Each time i pressed the power button it would light up less and less until even that wouldn't work anymore.
I ran every recommended diagnosis step on Apple's 'If your Mac won't turn on' pdf.
After a few days of trying the power button I tried once more, It turned on! Has been working again for about 10 days now.
I am still very precarious about using it now, and would welcome any suggestions as to what happened and how to prevent it happening again.
My bet is that there is a loose power connection somewhere inside.

I would perform SMC and NVRAM resets.
http://support.apple.com/en-us/HT201295
http://support.apple.com/en-us/HT204063
Run another Apple Hardware Test:
https://support.apple.com/en-us/HT201257
If you have the time, make an appointment at an Apple store genius bar and have them evaluate it. It will be dine for free.
Ciao.

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No longer turned on, then mysteriously it did! Any ideas why??

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