You can also hold down fn-ctrl-cmd and the power button, it's the only thing that works on my mac when it just shuts down and becomes completely unresponsive even though the battery is full. Holding down the power button for 10 seconds and the p and r key thing don't work and don't feel comfortable opening the back.
I have the same problems TODAY. No response from Mac Pro 13 “ Retina Early 2015 after holding down the power button. I try the SMC reset . Plug out the AC power. HOLD THE KEYS: SHIIFT, CONTROL, OPTION, AND POWER SIMULTANEOUSLY FOR 10 SECS. THEN Release. Hold down Power button for 15secs. It power up again. IT works !
"Had a similar issue on my 13” Macbook Pro (late 2013). The battery died while the laptop was left running and it wasn't powering bank on. None of the reset key combinations suggested would power it on.
An authorized service center diagnosed the issue (charged me about $30) and told me I had to replace the topcase (cost: $500+) - since there was a problem with the power button.
Upon opening up the laptop myself (since it was a 5 year old laptop at the time and warranty had already expired) using iFixit’s Pro Tech Toolkit (costs about $70) and disconnecting the battery and then plugging in the magsafe connector, it powered back on. I then put it back to sleep by closing the lid and connecting the battery back in.
I indeed seem have an issue with the power button but as long as I maintain charge in the battery I don't have to use the power button, I can just easily continue to put it to sleep and waking it back up using just the lid. Oh and I can also restart without any problems. It's only when I let battery die, or shutdown, that I have to open laptop, disconnect the battery, and repeat the process."
For someone who doesnt work with all those method my macbook pro got green light on mag safe charger but always show up with red charger icon , try quickly move a bit of the charger then turn on suddenly ! I know its weird but its work for me
