JLG

Hi all I was in rehearsal for 5 hours y'day and all was well. Took my gear home - Hartke HA3500 through a 115 Hartke cab - and switched it on this morning but there was no power. I checked the fuses (in the compartment above the kettle lead) and of the 2 fuses, the T4AL 250v fuse has blown (the other fuse is T8AL and is fine). Any idea what might have caused it? Is this any indication of another issue? I have replacements on order (I couldn't find a store nearby that stocked them). Thanks in advance.