HELP... No sound from speakers!

I have a 2000 Sonoma and it sat for four years... now the sterio works but I'm not getting any sound from the speakers, no static, no noise at all... replaced the stock unit with aftermarket cd and still no sound... what could be the issue? What was "theftlock"? How crazy is the wiring from the sterio to the speakers, do I need to take it in or are there things I could check on my own... wiring junctions etc... ??? I'm new to this forum business so any help at all would be awsome... and yes, "nomas" kick @ss, especially stepside SLS's.