You will be fine, lower numbers mean more draw. At any given voltage drive level, a 4? (ohm) speaker will draw twice as much current as will an 8? speaker. Since you are running a 8? amp with 6? speakers, you will actually be drawing less current then your amplifier can handle. This may lead...
What happened is she probably bumped one of the wires. I would check all the cables, if you have the manual for the TV check that your cables are plugged in correctly. You could also unplug all cables, and restor the factory settings on the Tv and DVD player and then start plugging all the...