Hi I have a HP pavillion desktop pc model RQ450AA-ABG m8080a with 3Gb Ram soon to be 4-6Gb, CPU is an intel Core2 6300 1.86Ghz, BIOS is Phoenix - AwardBIOS v6.00PG Version 5.16. Motherboard is ASUStek LEONITE Serial MS1C71S21502966. 1 DVD Writer and 1 SCSI SATA-2 Hard drive. USB Card readers x 4, and running windows vista home premium. Now I am attempting to upgrade the video card from my old Geforce 7600GS 512Mb to an ASUS EAH5770 CuCore 1gb card. I upgraded my psu to an A-Power 860w version with duel 12v rails each at 28A and 26A to supply the new card (Old PSU also didnt have pci-e power output for the card), and i also researched and tried almost everything like uninstall old display adapter and drivers reboot with new card and no display, tried from onboard with new card in and no display even tried the wrong thing to see what would happen while the comp was on i plugged new card in and restart and no display. Old card works, onboard works, but as soon as i put new card in doesnt work. Fan on card works but it doesnt give signal from vga or dvi. Made sure that its booting from PCIe in BIOS, Got new drivers installed first before putting card in to see if that worked but no. I just dont know what else to do. Wouldnt think it would be the power supply its way over what it says it requires and i did check with the dealer if it would work. only thing i didnt do was update the BIOS but everywhere i read that didnt seem to be the problem. Cant find the right answer anywhere. SOMEONE HELP ME PLEASE!!!!!!!