Double check all of your connections (RCA inputs on amp/outputs on deck; speaker wires on amp, inputs on sub, etc...) to make sure signal is making its way from the deck to the amp. If any connections loose/unhooked, reconnect them.
While your old sub was out is it possible that the speaker wires shorted together? This can cause the amp to blow it's output channels which would mean the amp is dead/needs repair.
Also, you said that you got a new sub.... does this mean brand new sub purchased from a local retailer or does it mean "new to you" where you bought it on craigslist/ebay/some shady online store. If it wasn't bought brand new in box from a local store I'd say there is a 30% chance that you bought a defective sub that the previous owner knew was dead when he sold it.
What is the make/model of the amp and sub? I ask because it's possible (not necessarily likely) that if it is a low end amp that initially it had a surge/spike that took out the amp AND fried your old subs voicecoil simultaneously.
If you want me to spend 10 minutes looking it over for you I can do that as well for no charge.
701.541.3484
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701.541.3484
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