Why are my high speakers not working?

My high speakers are not working at all. only the subs are kicking. i have a two channel 360 watt JL Audio amp and two 10 inch JL speakers with a panasonic head unit. honestly today i had an 11 hour drive from florida and they worked just fine until i restarted to car from my gf house to get to mine. this has never happend and i have already checked the inline fuse to the amp which of course isn't blown and the two fuses to the radio in the console and both are fine. please. help..