Never heard of it. You should get a quality psu with 80+ efficiency.
Might be the psu causing the problem. Get one from Corsair or Coolermaster. A bad psu might ruin your entire system (which is a nice one).
I would not try anything until you have a better psu. If the shop is willing to give you a brand new mobo, accept it, but I would not connect it to your current psu as you risk of dammaging it again.