Hello All....I purchased an 2004 Avalanche that had a Kenwood DDX-7019 with NAV, XM, and an 8" Monitor. The radio was all static, BT worked perfectly but nothing else seemed to work. The Monitor, showed input but nothing else. When disassembling the dash, i noticed the antenna was disconnected.....reconnected it and went to re assemble but all sound stopped working.....I do not see anything disconnected and it is like it is muted. Next is the GPS, is there anyway to know if it is working? There is power going to it but no pic. It is plugged into the Monitors switch behind the glove compartment.

Ideas on where to begin?

Thanks in advance~