Amp jus stopped working??

Well let me see where to start... i have a jensen 650 watt dual channel amplifier...i have had it for about 2 years and well the other day i was just driving along and it completly cut out on me and now i cant get it to work...my fuses are not blown the 2 on amp and 1 on battery, my wires are all correctly connected im bumfuzzled to say the least...The over heat / short light is not on meaning there is no short in the circutry....The one problem i did have was at one point my power cable did disconnect and when i reconnected it did spark but other then that i checked my ground no problem there, the power does get to the amp my little blue light comes on...i just really dont have a clue wht the issue could possibly be....perhaps someone here has a solution or can help me figure out the actual problem?? well in best regards i hope this can be solved..