I don't have openGL, can that be a problem?
The E@H screensaver graphics do require OpenGL.
What operating system are you running? If it is Windows (98SE or newer) it it's actually hard to remove OpenGL support from the system if you don't disable it explicitely. If the graphics card doesn't support in hardware, it should be emulated in software.
Can you see the graphics in a window (i.e. select the running Result in the BOINC Manager or 4.19 client and click "Show graphics" (right-click on the Result in 4.19))?
BM
