I installed a GeForce FX5200 PCi adapter in an Acer Aspire G600 desktop. The adapter was recognised in Device Manager, but did not display on monitor. The amber light when the monitor is on usually changes to a steady green and displays data when in use. This monitor just had a flashing green light but no data display. The onboard Sis still worked. Advanced display settings showed only the Sis, so I couldn't run 2 monitors (not that I want to). Is the onboard Sis PCI or AGP? Is there a way to disable the onboard Sis? Will the Aspire take another adapter?