ok so i had a bulb go out on my oddyssea fixture, ( 2 65 watt pcs, 1 250 watt metal halide) so i bought another bulb, exact same size, and watts, i havent for sure fonud out if it is the fixture but i know that the new bulb wont turn on, so im letting the other bulb that works for sure cool down and then im going to put it in the other side of hte fixture to see if something electrical is oging on, if it is something with the fixture what do i do?

Did you let the ballast cool down? If not......its possible that its that. If not.....its an off brand fixture......call them and tell them what happened and ask if you can get another bulb and what kind to get.