Try the following actions:

• If you are using an S-video cable to connect to an external display, move the NTSC/PAL switch to the appropriate position.
• If you are using a VGA cable to connect to an external display, try presenting using a lower screen resolution.
• If the presentation is blurry, if possible, use a VGA cable instead of an S-video cable to connect to an external display.
• If the presentation is not centered, return the external display to its default settings. For more information, see the documentation for your external display.