I'm looking for a little insight here... I got a Hewlett Packard Pavilion a420n computer for Christmas, and I am trying to ad an ATI 9600XT with little success. When I add the video card, and turn the system on, I'm not getting any signal from the monitor output. If I try to switch to the system's original monitor output, I don't get any signal either. Even though I'm not getting any monitor signal, it doesn't seem like the system is booting up completely. If I remove the card, the original system monitor output works. I think there is a conflict between the onboard video and the new video card. The computer has an AMD 3000+ processor, 512mb ram, and a 250W power supply. The motherboard is made by ASUS, but I can't find out a part number except for HP's name for the board, which is "Kamet2". The mobo itself has the VIA KM400 chipset with 3pci and 1 agp slot. I know the power supply is a little anemic, but HP said the card should work in the system, but couldn't provide any additional help. I've tried disabling the onboard video through the control panel, and removed the S3 video drivers through add/remove programs, but with no success. Windows XP just seems to reload the drivers when I restart. I've also looked under the BIOS setup, and there don't seem to be too many options that would affect the video. The only option that seems would pertain is one relating to selecting the video source. There are 2 options, PCI and AGP/ONBOARD. The default setting was PCI, but I don't get any effect when changing this option. I've followed the vid card instructions, and have even downloaded the new Via Hyperion 4-in-1 drivers to get the latest AGP GART. Has anyone had this problem before, and can anyone point me in a new direction? My next step is to call ATI tomorrow, but I'm not sure that they'll be able to help me... I'm dying to play some decent looking games so any help would be appreciated!!