I just got a Precision M4700 with Windows 8 64bit and an AMD FirePro M4000 graphics card. According to the Dell website and to other articles I have read, in addition to the laptop's built-in display I should be able to connect to two other displays without the docking station or five other displays with a docking station. However, so far I have only been able to get one external display to work even if I use the docking station. If I use certain ports I can get two external displays to work, but only if I disable the built-in display.
Without the docking station, the laptop has one HDMI, one VGA, and one DisplayPort. I have tried connecting my two external monitors to these ports in every possible combination. Every time I connect the second external monitor it is detected in the Windows "Screen Resolution" dialog but defaults to disabled. If I try to enable the display and click "Apply" then I get this message:
"The display settings could not be saved. Please try a different combination of display settings."
After I first had this issue with the default drivers pre-installed by Dell, I tried updating to the most recent driver available from the AMD website and I still get the same issue.
Any ideas are much appreciated.