Many radios also have an in-line fuse on the 12v line close to the back of the stereo, some have a fuse within the radio itself but usually easily accessible.
After that, if you have a meter, you could check that you're getting 12V to the radio with the ignition on (or at acc). As it's a 00, it almost certainly has one of the standard ISO connections at the back. You could try connect a radio from another car into this. If that works, the problem is with the radio, if not, in the wiring leading to the radio.
Leo