Before you pull the clock out, try to check on the fuse first.
If fuse good, then check on the clock! simply by pulling the entire clock panel toward to the windshied, then you can figure out it is easy to get the panel out. (Don't be shy, try to pull hard). Then, check the plug connected to the clock. If the plug is no problem, then unplug the plug and use a volt meter to check all 4 wires have proper juice!!!!!!!!!!