No pwer to unit breakers OK but manual says check fuse on board where is the fuse?

Most plug in, like the automotive type, if it has one look a little harder not all furnaces have one
Maybe if we had a brand name and model number could help you better

I blew up a picture of your circuit board,, could not see a fuse

It might have a inline fuse,look at your wiring diagram,it shoulsd show if and where a fuse is located

Have you checked with a meter to make sure there is power at the furnace ?
If not, possible bad breaker