Audio Systems: dodge radio problem, infinity sound, system amplifier

Question
I have a 2001 Intrepid rt with the infinity sound system.It will just flash the display(time,station)and not come on.It worked when i bought the car,even though it did the above and would pop on.If i turned off the car it would not come back on for 12 hours.Bought replacement radio on ebay and had it professionally installed and would not work.Thanks.

Answer
there is a relay on the right side of the radio that turns on the infinity sound system amplifier
it can be defective but before you do that check all the fuses again it sound like you are missing one morepower
there is a fuse box on the engine compartment
good luck