Complete lack of start up.

[BBROWN1664]

If it is a blown fuse then you still have to find the reason it has blown.

Could just be old age. too many heating and cooling cycles and the just go.

As an aircraft engineer I was taught, find the fault before resetting any circuit breakers or replacing any fuses. Real life taught me, reset the damn thing and see if it goes again, that way, IF it goes again you may see the spark or hear the pop where the problem is. At worst, you will at least have a fresh puff of smoke to sniff for.