I have a Dell OptiPlex 745 running 2008 R2 Std that I want to use dual displays on. Flag/p doesn't do anything. When I right click the desktop and select Screen Resolution, I see only the Standard VGA Graphics Adapter on my list of displays and only 1 display is shown in the ...appearance... window. Both displays are connected to the ATI x1300 display card I have installed and show the same screen.
I load the ATI Catylist x1300/1550 drivers for Vista 32-64 (that works with the same model PC running W7 Pro 64 bit), the install finishes, but Device Manager still shows only the Standard VGA Adapter. The BIOS doesn't have a selection to disable the on-board VGA, the best setting (and the one that works with W7) is auto.
I went into Device Manager/Standard VGA Graphics Adapter/properties/hardware IDs and found 4 listed. I did a search on each string and find they relate to an ATI HD 2400 XT, which appears to be the Dell on-board adapter which does not have a display attached.
Also installed the Desktop Experience feature in 2008 R2 - no difference. Ran Windows Update hoping to find a new driver - no such luck. Uninstalled the driver (BTW, no features found) then reinstalled. No difference.
Any ideas on what's going on? I read something that suggested that dual displays through Terminal Services didn't work in R2 Std or W7 Pro, but am finding it unlikely that's my problem here.