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Which computer (module) are you referring to?
Generally: disconnect the battery for 20 min. This often helps to reset the modules (computers).
Note: if not done, you should look for the radio code. Originally part of the paperwork that came with the car (often a rip out card in the operator manual). Some write it down in the manual. If the radio is without power for a long time, it may be required to enter the code again. If code is not available, the dealer can look it up by VIN number and serial number of the radio (need to remove radio typically to get the serial number).
On GM products, usually the radio will stay on (even with key off) until you open the drivers door. Maybe your drivers door ajar switch isn't working properly. Also try disconnecting the battery for 5 minutes and see if that helps to reset anything.
Your radio has an anti-theft devise that shuts the radio down if the radio is stolen(when the power is lost). You will have to have the anti-theft code reset by a dealer. There is nothing wrong with the radio.
This is simply a low battery issue. If you replace the batteries it should work. Apparently, the unit has a voltage sensor that cuts off the radio when the voltage drops too low. However, eventhough the radio will not run, there is still sufficient voltage left in the batteries to run the light.
This is why the radio will run when plugged into AC.
For the Clock/Radios that are having problems with the clock display and settings. You will have to reset the Clock/Radio's microprocessor. To do this you must unplug the Clock/Radio from the wall outlet and remove the internal battery. You must let the Clock/Radio set with no power for at least 1 hour to discharge the microprocessor circuits. The microprocessor should then be able to reset itself. You can then reinsert the battery and plug the Clock/Radio into the a/c wall outlet. The functions should have reset and be working normally. If this does not solve the problem, try putting in a new battery (CR2430). Before putting in the new battery, unplug the clock radio and remove the old battery and let it set again for a few hours this time to try to reset the microprocessor. If this does not solve the problem (This includes the person with the complete Clock/Radio operation failure) you can call the Emerson customer support at this telephone number 1-800-898-9020. Give them the make and model number of the Clock/Radio. Tell them the problems you are having with the operation of the Clock/Radio and ask them for assistance. I hope this information helps you solve the problems your are having with your Clock/ Radios.