The clock seems to have no power. The radio and

Check your cigarette lighter/aux power port it may be on the same circuit as the clock. If the fuse is OK then it is likely an internal issue with the clock itself. This is a very common problem with several clocks. I offer a repair service that has a lifetime guarantee and is several hundred dollars cheaper than buying a new clock (that will also eventually fail).
Check it out www.autoclockrepair.com