previously, i had a biostar "p4m890-m7 pci-e" motherboard. now i have an intel "d955xbx" motherboard. my psu, an Ultra 550W modular, has a 4-pin cpu power connector anda 24-pin main power connector. however the new motherboard (well actually its used) needs an 8-pin cpu connector in addition to the standard 24-pin connector. i have tried to use this motherboard with just the 4pin connector. however, it doesnt work. no video (tried with geforce 6800 ultra edition pci-express and a pci radeon 7500) no beepas from internal speaker, so i assume the 4pin isnt good enough. do i need an adapter? thanks. i dont know what to do, or what i need, or if i killed the mobo, or if, since i got it used / untested ( i can return it no problem) it was dead before i got it.