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You may have blown the speakers or crossover network (if equipped). Although it isn't likely that they all went at once.. unless you severely over-drove them with an amplifier. Check for bad connections at the speaker(s), any crossover network, etc.
First check whether the connector for the speaker wires is firmly plugged in behind the radio. Try unplugging and replugging to make sure. (Note: the connector may be attached to the radio or it may be on the end of a short length of wire.)
If the speakers are firmly plugged in and you still don't get sound, the next step is to test the speakers. Do this by unplugging the wires behind the radio, then run a meter across one pair (for one speaker) to make sure you don't have an open circuit (broken connection). Alternatively, feed audio from the speaker outputs on a boombox or other stereo to that pair of wires. If you don't get sound or if the meter says there's an open circuit or direct short, either the speakers are bad or there's a broken wire between the radio and the speakers. Most bad connections happen at one end of a wire or the other, so look at the connectors at the radio and at the speakers.
Finally, if the speakers do check out, you'll have to test the car radio itself. Run a pair of wires for one speaker from the radio's outputs to an external speaker (any working speaker will do). If there's no sound, your radio is broken.
Of course, the easy way to do this is take it to a place that installs car radios. They can check it out quite easily and make recommendations. Don't take it to a Chevy dealer. They'll charge you a fortune, and if the radio is bad, they'll sell a refurbished unit for more than you'd pay for a high-end Kenwood or Pioneer.
some of these cars have infinity sound systems if this is the case the factory amplifier probably went bad and a new radio and an amp rewire will fix the issue. you might want to check the trunk too soetimes people cram all kinds of things in the trunk and you might have broken a speaker terminal on the rear deck and it is touching metal and shorting out the radio causing the sound prcesssor to turn off. hope this helps.
if the radio powers on make sure it is set to an fm station by pushing the S button. then turn the knob on the left to turn the volume up. if there is still no sound it is most likely a radio gone bad or the amp has gone bad.
I have a strong feeling that the head unit "radio" has finally gone bad. You describe a situation, in which you have to turn it on and off, to get it to work. Typically if the sound comes out of all speakers, after doing that, then the speakers were never broken. The head unit itself should be replaced. I hope this helps.