The PSU starts spinning (so does gpu if connected), but soon stops.
No bios, no monitor signal
I'm running out of ideas. The entire build was done wearing rubber gloves. Nothing looks broken.
Tried a new kaby lake cpu
Tried 3 different PSU's
Trie new RAM
Tried disconnecting every GPU
Had it at the local repair dude, no bios, no signal.
Specs:
MOBO: AsRock H110 pro btc+
CPU: Intel i5-7400 kaby lake
RAM: Corsair Vengeance LPX DDR4 2400MHz 8GB
PSU: Corsair Rm1000x
Let's go back to basics here. Motherboard has the standard 24 pin main power, and then you will have a supplemental 8 pin power connector on the motherboard(normally near the rear connectors for your USB/ethernet ports and such along that top edge). Then you have your CPU. It is possible you damaged the pins, though that is uncommon. Then you add RAM and the CPU cooler.
With nothing else in the machine, no video cards(just the onboard video in the CPU), does your machine POST? I've seen a LOT of people forget to plug in that supplemental power connector to the motherboard and then freak out when the machine won't boot.