How does your clock come on in your 1996 Pontiac sunfire also the radio light does not come on?

If the radio works, but the display does not, you're probably hosed. I've read here that the the radios can be repaired, but I doubt if it's worth the expense.
When I bought my '96, I had the same problem. In addition, the covering/markings
on the buttons were worn and torn. I bought a replacement radio from an Ebay seller for about $45, if memory serves. It was from a Grand Prix, but was the same as as the one in my car. With luck, you can replace the factory cassette model with a CD model. Just be sure that the radio is unlocked, or that you have the security code. If you don't, you'll be in for another headache.