Question Z690 maximus hero not turning on

[CharlieH23]

I just built a z690 maximus hero and it was working great, i installed new lian li sl140 fans last night and took out the rog fans that came with the case, now the pc wont turn on, no lights, nothing. Any ideas?

 

[Nine Layer Nige]

Mains/PSU switched on - check all leads ?
Dropped a screw somewhere and its shorting out the mobo ?
Dislodged the power on pin connector on the mobo ?
Any debug lights on the board ?
Any lights anywhere ?