My Son has a Compaq S6000CL. We upgraded his PSU to a 500W which works great. Added a ATI Radeon HD 4650 AGP video card. Problem is that when the card is in the machine neither video port seems to work, not even the existing on-board video port. Remove the card from the AGP slot and the on-board seems to work fine. Only BIOS setting I have been able to find is for PCI/AGP-Onboard. I have tried both settings and results are the same. The MB for the S6000CL is the ASUS A7V8X-LA. Is there something I need to do to ensure the AGP port is working? Any suggestions on how I can diagnose the problem? With no video I feel really stuck. BTW OS is WinXP-Pro SP3
