PC won't Boot

Hi all

Since yesterday my system won't boot anymore. It was running fine for the past months and there maybe an issue with humidity.

The mobo is a z170 pro gaming and the psu a corsair**HX750i.

Before the Psu I have a line conditioner with fuse and Overvoltage protection, and before the line conditioner I have a backup ups with few protection features as well. *

The other components in the same room like the tv or my laptop work.

I am not seeing any condensation on the mobo or case as far as I can tell. Will do a complete dissembly today though. *

I have reseated the CMOS and Rams, I unplugged all connections and reseated them.

There is a test button on the Psu whilst pressing it the fan starts to spin which indicates / or should that the Psu is working.

Also all the lights / led on the mobo are on and lit.

The mobo does not show any error lights.*

When I unplug the power and plug it in again and press the power button I can hear a "click" only but then nothing. * *

It has been raining heavy in the past days here in Indonesia, though it did that before and the pc still started.

I don't have another Psu to test it. And not sure if it's the mobo. *

I am thinking of getting a dehumidifier today and try to dehumidify the room. *

What I did not try yet is to use a hair blower from my wife as I read it may cause ESD.

Other members in here had some success with this in an older post though.

Any advice would be appreciated. Thanks