Can anyone help please? i've searched the net and can't find an answer. I have a: Biostar p4m900-m7fe motherboard Intel p4 cpu 450w psu 2x1gb kingston ddr2-667 memory HD3450 256mb graphics card. With this combination vista won't boot, the mobo beeps once but then goes on a loop with no start. If i use the onboard graphics instead of HD3450 it works fine, and if i use all as above but with a 1gb ddr2-667 and a 256mb ddr2-400 instead, it also works fine. I have also tried a 128mb ati x700pro graphics card but to no avail. I can't fathom this out at all and presume there is a simple explaination or solution for this. Any help would be appreciated.