From the manual (the manual is on the Kicker website under the KMC2 unit - I asked their customer service and the KMC2 is identical to the KMC1, only difference being the 2 is for sale in retail and the 1 is for sale as OEM to boat builders):
Reset the KMC2 to factory default settings by pressing and holding the MODE
button for eight seconds.
Not sure it will work though if the unit won't power up.
Did you check the power wire right where it connects to the radio's wiring harness with a multimeter for 12v? Even though your fuse appears to be ok, a number of other issues related to bad connections could possibly prevent the power from reaching the radio.
Link to the manual is at the bottom of this page: