I had this problem last night, and found this article. Unfortunately, even the power button was unresponsive. After seeing a queue of 160 people on Sony's help center chat, I decided to unplug while it was still in rest mode. Left it unplugged about one minute, plugged back in, and it started fine for me. No more rest mode til a patch.
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Re: Guide: Can't Turn on Your PS4 from Rest Mode? Here's How to Fix Firmware Update 2.00 Issue
I had this problem last night, and found this article. Unfortunately, even the power button was unresponsive. After seeing a queue of 160 people on Sony's help center chat, I decided to unplug while it was still in rest mode. Left it unplugged about one minute, plugged back in, and it started fine for me. No more rest mode til a patch.