I had a similar problem with my old computer but that was when it was on its last legs. You can buy some cheap PCI USB ports or borrow some off of someone - Maybe that way you can determine if it's your BIOS which is causing the problem. Or you could simply send your motherboard back to the seller - If it is physically broken, it doesn't necessarily mean your other components are fried too unless your PSU is faulty.
Pages found on Google recommend you also remove the mobo battery for 5-10 minutes before reinserting it, rather than putting it back immediately.
There's also some kind of jumper you can toggle to reset your CMOS, apparently.