Buttons on my 2000 vw beetle radio that changes it from fm,am, cd,and tape will not push. It is stuck in FM

No it doesn't. The head unit is faulty and requires repair/replacement.

You can try this. It's for a Passat but it's most likely the same for all models that year.
1. Turn the radio on. "SAFe" should appear on the display.
2. Push the AM/FM and SCAN buttons. Hold them until the display changes to 1000, then release. If the buttons are held too long or accidently pushed again this will be interpreted as entry of an incorrct code.
3. Enter the code usung the first four station programing buttos. The code will appear on the display.
4. Push the AM/FM and SCAN buttons and hold until the display changes to SAFe. Release the buttons.
After 2 incorrect tries the radio will lock up and refuse any more tries. Leave the radio on for at least 1 hour and then you can try again. Same deal, 2 tries and then lock up. The radio does not lock up permanently.
This needs to be done any time you disconnect power so write it down somewhere and keep it. Any time you disconnect the battery or disrupt power to the radio, blow a fuse or remove the fuse it will have to be done.
Hope this helps.

youre going to need to get the radio code from the vw dealer. there is no way around this. you will need radio serial number and the vin off the door of the vehicle. once you have this info, write it down in the back of your owners handbook. to get the radio serial number, the radio will have to be pulled out.

Which is selected, FM/AM, CD, TAPE? Make sure you have a proper selection and are receiving a signal.
I would clean the front radio panel to be sure none of the buttons are being stuck by dirt, etc.

Your code should be 2101.

Use the preset buttons to input the code. Preset 1 scrolls through digit 1, preset 2 for digit 2, etc.

Once the code is set, push the unlock button; depending on model the unlock button will be either CD, TAPE, or AM/FM.

I have come to find out that in the 90's auto makers started installing factory amplifiers in their cars so they could use low wattage stereos in the dash. It's usually a blue wire off the stereo that runs the amp, maybe it couldve become disconnected? I also know that even if you put in an after market stereo, this wire must be hooked up or you'll get no sound from the speakers. hope this helps.

Need code for radio
Model# MR490090
Serial# 99D22887

Get some contact cleaner spray turn power off . And spray the knobs and the push buttons. Then keep pushing an turning the buttons an knobs .Let sit 30 min an blow them out with can air.Turn on see what happens. Some times you my have to do it 2 times. Are Spary and let sit overnight. Ford an Mercury's are bad to get moister in them. It worked for me a lot.

You'll need a specific tool for a specific radio that could be one of this.

were the lights working before?
sounds like a defective radio.