Air Bag indicator lit

This is on my "new" 2007 Sonata. When I cranked it this morning, the airbag indicator on the instrument panel lit for the usual self test, then went off but immediately came back on. I killed the ignition and re-started it with the same results. When I got to my destination, I parked it for 4 hours. I hoped the problem would disappear, but of course it was still lit.

Yesterday, I loaded half my son's college dormitory room into the car and drove it home. There was no problem during that trek, but a TV and a dorm-fridge rode on the back seat. Is there any wiring or sensor that could have been damaged by that load?

I'll check for fuses this afternoon, but generally, if a fuse pops, something else caused it. Any other ideas before I use $20 of gas to go to the dealer?

I would take it to the dealer i had the same thing happen to my car and i was told it was a wiring issue. 

Yes, get to a dealer and get that looked into.  It's covered under the warranty and you don't want problems with the airbag system.

According to the dealer, it was a bad connection on the passenger side seatbelt.
They fixed it and washed my car. Good service so far.