Your key battery is probably dead. You could take it in to the dealer and have them charge it up for you, but they only seem to last about 5 years and then won't hold a charge.
You'll need to get your new key from the dealer. It'll cost about $175. They're pretty easy to program, but you need both keys to do it.
If your car battery is original (probably is) you'll want to replace that too. I bought my 07 from a used car dealer and they had put a cheapo battery in. It's quite a bit smaller than the stock battery, but seems to work fine. Autozone sells a direct replacement too.
Sorry, can't help with the radio issues.
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