Motherboards Will only power on after removing and reinserting 24 pin plug

Good News !

All seems to be working. And the winner of the correct answer in this thread is .......

I tried 7 batteries. 5 of which were brand new.

I used one of the brand new batteries for my car key fob.... dead. Tried another... dead. Smelling a rather large rat I have bought some more batteries. Car key fob works. Took known working battery from car key fob and inserted into motherboard.... boots up after plug left out and everything seems to be fine. Other new batteried work in car key fob.

A whole batch of dead new batteries (expires 2023).

Thanks to everyone who took the time and trouble and replied here. Its much appreciated.

 

Like a baws.

 

I've got 100 2302 sat round for this exact reason. What batteries are you using? I use GP or Varta (varta costs more). My dad repairs car / garage fobs for a living and swears by GP and Varta.

 

The duds were duracell !!.

EDIT: No they weren't they were Energiser !

Got some Panasonic ones now. all working.