I just did something similiar, I just removed the chip. Same result, it says it is initializing and shows the cassette tape icon which I don't have. The radio had a date of 2001 and I put it into my 2007 Chevy Express. This radio/CD has better reception and sound than the stock radio that was in it. Plus my tuner dial didn't work well anymore.
If you want a quick way to get the radio to work temporarily, you can (key turned off) press and hold (seek>) and the (5) channel button together and then at the same time hold the power button on. All 3 buttons at the same time. This should turn the radio on, then start your vehicle. The radio should work, the CD may work, the station buttons may not and you may not be able to switch AM/FM/CD. Once you shut off the ignition you will have to start the process over again.