So you get a black screen with the mouse cursor displayed? If you answer that question with a yes then EQ isn't locked up it is a display error. If you answer no to that question then explain the problem with more detail.
The most common causes of the black screen with mouse pointer issue are lack of directx9c and resolution issues. Wide screen resolutions and multiple monitors are not natively supported by Everquest.
If the resolution adjustments didn't work then download and install directx9c. You can download it from here:
http://www.microsoft.com/downloads/e...displaylang=en
And no it does not matter that you have directx 10 or 11 as part of Windows Vista or Windows 7. Installing directx9c will not replace or harm anything it merely adds the runtime components needed by Everquest.