Help! GT70 No Boot...

Hi,
Looks like a failing component on the board.
You can buy a brand new motherboard on ebay / ali for cheap:
https://fr.aliexpress.com/item/2039...earchweb0_0,searchweb201602_,searchweb201603_
FYI, GT60 and GT70 motherboards are exactly the same.

 

This could be anything. A corrupted bios, hardware failure, etc.

Try booting it with minimal hardware (disconnect disk drives/ssd), reseat memory, try fewer dimms, check the cmos battery. It could be a (partial) short on the board. There are no relays that make 'clicking' sounds, but (mostly) 2 mosfets that act like a switch/relay, and are there for protection in case of hadware failure. If a (partial) short is detected (over-current), the machine will shut down. Any decent electronics repair service should be able to diagnose a failing/shorted board.