If your sure all your connections are good, I would say that amp is shorted out internally. Depending on how badly, it can be fixed.
-Ken V.
1998.5 SE Praire Tan Zetec ATX
psycho_bass@hotmail.com
Roush springs Roush rear sway bar BAT struts 17" Millie Miglia HT3 and a ton of subtle asthetic mods