Have you got an ohm meter? measure to find out if the power and ground terminals are shorted? that would blow the fuse even before you turn it on.
If it's a newer amp, most of them have gone to a solid state (silicon) relay for remote turm on.
Did it smoke? Does it smell like something fried?

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP