At a first approximation, the simplest thing to check is that all your fuses are good. Most automotive fuseboxes are labeled as to function, so try to identify the instrument panel fuse, or maybe even radio.
Make sure you, or someone with good close vision, checks ALL the fuses that are supposed to be operating. (There may be space in the panel for spares. It's good if they are usable, but not until they get plugged into something.)

Dosen't mean you should!
The fuses were the first thing I checked when the radio went out. My own idea on that is that the vehicle came from a very wet climate to a very dry one, and the coating on the wires may have dried out to the point that they cracked.
I don’t know if that’s even feasible, but the first hot days we got after the truck was delivered, the alarm would sound for no reason, then stop. It works like it’s supposed to now, though. Still no response from the radio.
Like I said, no one is willing to trouble-shoot it for me unless I pay them. You and I both know THAT isn’t going to happen!