Radio has power the display button works but radio will not play

Step 1: Look at your radio. Check and see if the code "RDS" is written on the face of the radio. If "RDS" is present, contact a GM dealership to have your radio unlocked by them.
Step 2: Check for the identification code. Press buttons 2 and 3 for 8-10 seconds. If a code does not appear on the display, you won't be able to unlock your radio in this manner.
[If that doesn't work vvv]
In order to obtain your radio unlock code, you need to find your radio's serial number. You can get the radio serial number directly from your radio.
Step 1: Turn on the ignition. Turn the key to "accessory" mode or "on" mode.
Step 2: Turn on the radio. Press the power button to turn on the radio.
If your radio displays any functions such as playing a CD, cassette, or a radio station, your radio is not locked. If no sound is heard, you may need to replace your radio unit.
If your radio is locked, "LOC" is displayed on the screen.
If "INOP" is displayed, keep your ignition on for 60 minutes with "INOP" on the display. After the hour is up, it should change to "LOC." After this you can proceed with the next step.
Step 3: Write down the code. Press buttons 2 and 3 at the same time and hold for 8-10 seconds. Write down the three-digit code that is displayed.
Step 4: Note down the code. Immediately press the AM/FM button. Another three-digit code is displayed. Write it down as well.
This is your six-digit radio serial number.

Now that you have your radio's serial number, you can obtain the radio unlock code from General Motors. Be ready with a pen and paper to write down your radio unlock code.
Step 1: Contact the GM radio hotline. From any landline or cell phone, call the toll-free GM Radio hotline at 1(800) 537-5140.
Step 2: Enter the code. When it requests a code, enter "106010" on the keypad, followed by the pound (#) sign.
Step 3: Enter the radio serial number. You will be prompted to enter the radio serial number you have just obtained.
At the prompt, enter the number followed by the pound sign.
Step 4: Write down the radio unlock code. The prompt will read out your four-digit radio unlock code. Write it down precisely.

Now that you've obtained your Chevrolet radio unlock code, you need to enter it into your radio.
Step 1: Switch on the radio. Turn your ignition on and press the radio power button. Your radio will display "LOC."
Step 2: Enter the first two digits of the radio unlock code. Press the hour button on the radio to enter the first two numbers of your radio unlock code.
Continue pressing the button repeatedly until the first two digits of the radio unlock code are displayed.
Step 3: Enter the last two digits of the unlock code. Press the minute button until the last two numbers of the radio unlock code are displayed.
Repeatedly press until they match the two digits you need.
Step 4: Confirm the code. When the code matches, press the AM/FM button. "SEC" will display on the radio, indicating a successful attempt to enter your radio code.
If you enter the code incorrectly eight times, the display will switch from "LOC" to "INOP." You'll need to leave the ignition on for an hour as described in Part 2 before you can retry.
Write the radio unlock code in a safe place such as in your owner's manual for future use.
Most car dealers will charge you a lot of money just to get the code for you. If you follow the right steps, you can get the code for free and be able to start listening to the radio again in just a few minutes!
How to Unlock Chevrolet Theftlock Radio

could be the speaker out put has come loose at back of radio as to have all speakers blow at once is just to much of a coincedence so pop the radio out and check wiring connentors if all ok looks likely the radio is needing replacing

The ON button is also a SLEEP timer. The timer can be set to 90 minutes, 75, and son on. The shortest time period is about 1 minute. Press the ON/SLEEP button several times. After each press read the number displayed. As you push the button again you will cycle through all available timer settings. Choose one that its long enough for you.
However if you press the ON/Sleep button for a few seconds the radio will play continusously until you turn it off.
Just play with the RED button a few times to get an idea how long to press to make the radio play continuously.

All you can do is remove the radio and have it repaired by a local approved GM radio repair shop.

To set time:

Press the [D] button for one second or longer to switch to the adjustment selection display. Press the > button to select "Clock". Press the play button. Press > to select between hours and minutes. Use the rotary knob to set the time. Press play to complete. then press [D] to return to the previous menu. To display the time, you should just have to press the [D] button while playing a CD or listening to the radio.

When you press the Power/Sleep button the radio turns on and displays a number 90, or some other numbers. This is the play time that the radio will stay on then turns itself off. It could be that yours is configured with a sleep timer set to 01 minute, 10 or 15. You need to set the timer for a longer period. Thus we turn it on by pressing the Power/Sleep button, read the timer length then press again. Keep making short presses: The timer will cycle through all preset sleep timer durations. Select the length you want.

Use the first four radio station preset buttons to enter the code.

1: Push radio preset#1 until first digit of your code appears.
2: Push radio preset#2 until second digit of your code appears.
3: Push radio preset#3 until third digit of your code appears.
4: Push radio preset#4 until fourth digit of your code appears.
5: Push either tape or cd button.

What to do if your radio says OFF instead of CODE
(Courtesy of mittech)

If your radio says OFF it means you entered the wrong radio code three times. To get it to say CODE again do the following.

1:Turn the key to on or accessory.
2:Push the power button so that the radio display says OFF.
3:Let the car sit for 1 hour.
4:The radio display will go blank.
5:Turn the radio on and it will say CODE again.

The radio screws holding the radio are not tight enough. to eliminate this problem remove the radio and adjust the pressure screw in the rear of the radio so it comes out farther>. if the radio is not far enough in the compartment to push in that button the radio controls will not work

Correct on the ribbon cable but parts can be ordered for it, duel has service centers, inc the one i work @. its abought a $10 part

Hi. your radio has 2 power wires. A red one and a yellow one (with most decks) It sounds like your radio is getting only constant power but no "key on" power. Check your radio with the key on you should have power on both the red and yellow wires. If you are missing power on one of the wires theres your problem. If you have power on both wires then there is something internally wrong with your radio...