Question Debug led CPU

[Lewis.nash96]

Hi all, I have a problem my pc won’t display anything and my key board won’t light up. I recently installed the Corsair h100i liquid cooler for my cpu but I forgot to wipe off the old thermal paste and apply fresh thermal paste would that sort out my issue

 

[Lewis.nash96]

But to what settings? I.e. Clock and voltages?

4.2 and 1.35V I followed YouTube videos