I have two ATI Radeon 5450 graphics cards in my PC (driving 4 monitors). On the first card, monitors 1 and 2 are identified as monitor 1 (even though they're both using separate cables/connections). Monitors 3 and 4 (on card 2) are identified as monitors 2 & 3.
I've never seen this behavior before! When I click on "Identify" int the AMD Catalyst Control Center app, the two monitors connected to card 1 are identified as monitor 1 (i.e. the computer thinks I have 3 physical monitors, not 4).
How do I correct this issue? Is there a jumper on the card that has to be set?
The OS is Windows 10 but this problem occurs WAY before Windows is involved. When I turn the machine on they are seen as a single monitor. This is a new system. Built from the ground up.
Note, too, that these two monitors are dimmer, slightly, than the pair that sits next to them on the other Radeon card.