Very few desktops come with built in speakers other than the single system speaker that beeps at startup. There may be a 3.5 mm headphone jack on the front or back to plug stereo speakers into.
Depending on the year there is a small hole which you stick a paper clip into next to the key hole. Pushing the clip in and turning the lock set toward accessory will allow the whole lock set to be removed.
Usually indicates you have a fuse that is blown. The owners booklet should show you where they are located and what amperage you need. Some vehicles have spare fuses in the fuse box.