I have an old but great Abit nf7-s motherboard running fine. Surge protected with ISOBAR surge protector and another computer on this surge protector. Lights go out. Every thing works except the Abit will not post and has no video. NO beeps no video. Everything spins up and works fine. Has changed 2 seperate video cards that work--no video. Changed CPU no video no post beeps. Is the motherboard dead?