I am running a VisionTek ATI Hd 2400 Pro PCI ex16 with a HDMI port, DVI port and VGA port. I have success with the DVI and HDMI running on two HD monitors. But I am having a problem using the VGA port to power the third monitor. It detects the third monitor but it is telling me I can only swap out the third monitor with one of the HD monitors in order to use it. Can anyone help me solve this issue.
You're limited to two displays with the 2400. You can get a cheap PCI-E 1x or PCI card to run a third monitor, or upgrade that 2400 to at least a 5670. You will need a display port to VGA, DVI, or HDMI dongle though, unless of course one of your monitors has display port.