Question Why are my monitors not gettings signal, and is my power button not working?

Aug 1, 2019
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I built my pc a few days back, since then it has happened twice that after starting it up and the fans starting etc., my monitors didn't get a signal and my power button on my case wasn't working, my keyboard rgb didn't light up either. but my motherboard rgb did. I have had to turn it off via the button on the power supply and then turn it back on, that worked. At the start I did mess a bit with the mobo bios (MSI click bios 5) maybe that has something to do with this?

Thanks in advance

(btw, my specs are: Ryzen 5 2600, Rx 580 8GB (MSI armor), MSI gaming pro carbon AC, 16 gb 3000mHz corsair Vengeance, 1tb hdd, 240gb ssd, 550W corsair power supply, NZXT H500)


EDIT:
I might have made a mistake, I have this cable left and since it has something to do with the power sw this might be it? Even though I do have the front panel connector installed, am I supposed to have to cable left? See pictures.
View: https://imgur.com/LsNBUHO

View: https://imgur.com/p3rybrv
 
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