My new motherboard worked well using the cpu graphics however I could not get anything from 3 different graphic cards. I changed power supply , memory as well but only onboard graphics worked. So I returned my new ( faulty) motherboard. The returns department of the vendor informed me I had bent some pins in the cpu socket. Not understanding the pin grid I am surprised everything worked except the discrete graphics card - using onboard I had no problem booting. Is this posible?