K, I've been struggling over this for the last week or two and really need some help. Simply, I'm running a 10" sub off of a Sony XM-504X amp. Everything worked fine and really thumped. Jumped in one morning and started playing some music but i noticed the sub wasn't working. As random as that. There is an indicator light on the amp Green-Working fine Off-Cars off Red-The head is turned on but the amp isn't working (I think this is like a standby mode) I can turn my amp on (green light) and the whole setup works at really low volume, but as soon as i turn it up the amp stops working and the light turns red. I've checked every wire Tried my friends sub with it Good Ground I just can't figure out whats wrong, plz help.