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I searched here and in google to find solution to my Chromebook power on problem. It was frustrating as no one had addressed it so simply as I discovered by fluke. All I need to do now is simultaneously hold CTRL and power on button for about a second. Then simultaneously hold SHIFT and power on button. Starts up immediately after that. Yay!! Hope this helps someone else with this issue.
[Edited the thread to add issue detail]
That should not be the case of powering on a Chromebook, your problem seems like a power key switch problem that needs replacing. What is the Acer Chromebook model number?
This shows that the keyboard may be shorted.
Thx for comments! Model No. N3160. It works perfectly now. After reading comments, I also pressed power button for a second, released, and then it started about 3 seconds later. I'm used to my Dell laptop and iPad—both of which power on immediately without that 3 seconds lapse. I think this is the norm with this chromebook now though I bought few years ago and problem only surfaced in last few months.
Acer Chromebook 14 CB3-431 Intel Celeron N3160 @1.6GHz 4GB RAM 32GB SSD