Aspire F5 572g not turning on

Thanks for your help in advance.

My acer(Aspire F5 572g, approximately 2 years old) does not turn on at all. I was using it and susudden it turned off and cannot turn on anymore. CPU fan only works with battery and once battery is removed, CPU fan no longer works.

I tried hard reboot - no success
I removed battery and tried with AC adaptor - no success.
I unplugged RAM and plugged in again - no success
I tried connecting to external monitor through HDMI cable - no signals on the screen
When I keep pressing power button, I can hear audible clicking sound repeatedly but nothing happens.

Any helps much appreciated.

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JackE

Sounds like either the power board connector to the mainboard came loose or needs to be re-seated a few times to clean its contact. The power button itself is mounted on this flexible board. Unfortunately, the top assembly must be removed to check on this. Jack E/NJ