Window controls and radio stopped working

My vehicle was parked outside for an hour (seventy eight degrees, no rain) and when we started it up, the power window controls and radio stopped working. Visually checked fuses and relays; no problems. Saw a similar post about someone who had the exact same thing happen when she closed her glove-box. Where do I begin to track this problem? Checked all fuses and relays under-hood and in pass compartment. All look okay. Only one relay/breaker (under-hood)controls power windows and four in passenger compartment fuse box affect radio/navigation. None blown.