Twin Turbo: No Video Caused by StartupScreen in System Folder

Power Computing provided the information in this article and it was deemed accurate as of 14 November 1997. Apple Computer, Inc. is not responsible for its content. This article is being provided as is and will not be updated in the future.

I am using an IMS Twin Turbo graphics card in my computer and I only get 640X480 as a resolution in the Monitors and Sound control panel. The Twin Turbo control panel gives me no resolutions. I am using version 3.8 of the Twin Turbo Control Panel and have tried version 4.0 with no change. How can I fix this?
While there are various reasons that this could happen, we have confirmed one cause. This is having a "StartupScreen" in your system folder. With the MacOS, it is possible to have a file that is saved as a Pict Resource and named "StartupScreen" (no quotes) that when it is placed loose in the system folder it will show the picture during startup. If this file exists on a computer with an IMS card and the twin turbo software, you will only get 640X480 as a resolution. Removing this file will fix this issue.

Machines Affected: All
Published Date: Feb 20, 2012