Radio, HVAC system, car control panel do not work?

The center console (radio, HVAC system, car control panel) does not work. I initially suspected that it was a fuse but could not seem to find a single fuse that would cause everything on the center console to fail. Manually checked fused and did not see anything wrong. I then assumed it was a faulty center radio/display panel since that is common to all the affected systems. I replaced the center control panel with the one I located on eBay, and that did not correct the problem. Now I have a Power Probe and believe I need to be more thorough with the fuse checks, but would really like help determining the most likely causes and breakers to check.