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assuming the 2005 model year stil uses viper security systems...the chip in the key carries a magnetic resistance frequency. if the chip is damaged or corroded the frequency will change and wont engage the igntion. you can either get another key made (about 75 dollars) or bypass the ignition lockout feature.
If the passkey is messed up, there will be a light on the dash that says security, or have a picture of a car with a lock thru it. If there is no light when the key is turned forward, then its NOT a passkey problem.
stick the key in the ignition, turn it to the on position, remove it within 5 seconds, then hold the unlock button down and press the lock button 3 times within 10 seconds and release both buttons. The doors should lock/unlock to give you confirmation and your key should work.
it's highly unlikely, there are only two things that can make this happen, not getting fuel (fuel pump failure, fuel pump regulator) or not getting ignition (bad coils, ignition module failure, bad distributor, distributor cap, rotor)
I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.
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