Unplugging it from the wall should reset it. Rosewill's aren't that great of a unit. At least if it doesn't turn back on, you can always rma it back to newegg.
ok so my sister flipped the switch on the power converter thinking it was a pwer button i guess i dunno. well nothing smells burned ir fried and the motherboard looks fine the computer just wont turn on. what are the chances i just have to get a new power supply?