That firecracker sound you reported is troubling, something is likely
damaged and ought to be isolated and repaired or replaced before the
system is powered up again. A fuse blowing makes little to no noise.

Fuses don't make any noise when they blow but capacitors do. If the cap
was on the motherboard it will be obvious, look for a scorch mark. The cap
might be inside the power supply in which case you'll have to take the
supply apart to find it (I wouldn't bother, I'd just dump that supply in
the trash).