I just bought a new motherboard,everything is fine,cpu working,ram working,but my video card wont start.The motherboard is Gigabyte GA-770T-D3L,my video card is Palit GTS450.I tried with old Geforce 8600GTS and i had the same problem.Now im using it with Ati Radeon HD 3600.When i plug the 450gts or 8600gts there is 1 long beep and nothing happens,no signal to the screen.I tried them on another build and they are working fine.