What a mess. I removed a GEForce graphics card from a Dell Optiplex 320 tower. I installed it a while ago for a dual monitor setup for a user & think it may be a bad card.
After I removed it, I plugged the monitor back into the built-in monitor (blue) connection/port. (Original graphics card built into motherboard.)
When I turn the user's computer on, I get this message:
"No ATI graphics driver is installed, or the ATI driver is not functioning properly. Please install the ATI driver appropriate for your ATI hardware."
Also, the screen started up completely black & now flickers.
When I look at Device Mgr for display, it says "ATI Radeon Express 1100". (I'm not sure if this was related to the GEForce card that I just removed)
Before I installed the GEForce card, I believe the display was "Radeon 7000 Express". (I'm wondering if that's what is built into the motherboard?)
Basically, I don't know what I'm doing and just need to get back to a functioning screen (and I'll deal with the dual graphics card later, whether it needs to be thrown/returned).