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My guess would be that the resistor block located in side of air duct between blower fan and evaporatorbox has burnt out one or two resistor coils and requires replacing or repair.I have never seen Volvo A/c but would expect this to be the problem.The block is located in the airstream to keep it cool .By moving your setting switch you are selecting differing resistance coils (or a combination of same) thus with failure lose various speeds.
Not positive it is the same thing, however, when setting up my iPOD adapter to the radio, I made the mistake of not following the instructions to the T, and it caused my sunroof to stop working... after a day (which I later found out gave the system enough time to "reset" and connect), I turned on my stereo, pushed the 3CH to Dolby Surround, and that did the trick. It's been about a year... and I've had no problems with the sunroof!
Check the fuse in the car charger, and try in another car. The manual with should show where the fuse location. (because it worked befor you charged it,sounds like the car cord fuse is blown or the cord is defected)
If it is a combined radio/stereo system the drained battery may have caused it to lose it's code - you will need to re-enter the radio code to make it work properly. This is similar to removing the battery from the car - you have to re-enter the radio code before the radio will work.
If there's no power at all to your stereo it's possible that jump-starting the car has caused a power surge that has blown a fuse. Depending on what type of radio/stereo is fitted, there usually is a small in-line fuse in the wiring at the rear of the unit. Check the fuse.