Well, hate to state the obvious, but did you wire it correctly? Did the original system have an external amp that you may have missed while hooking up the wires? Is your antenna wire plugged in to the head unit correctly?
It's been my experience that if you've got the correct power wires connected coming into the radio and the output wires going to the correct speaker wires, you should be getting sound - unless there's an issue with the new, aftermarket head unit.
When I put a new head unit in my wifes '95 it was a matter of identifying an "always hot" 12V source (for the radio/clock memory), a "keyed" source (so the radio would shut off when the car was turned off) then figuring out which of the speaker wires went where - I used a conversion plug to keep from having to cut the stock harness so I did all my wiring on the workbench with a soldering iron -
If you're not getting power - check the fuses - you might have popped one while working with the wires inside the dash and not have realized it -
Best of luck
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