Optoma TW775 User Manual page 59

Check if the projection lamp has been securely installed. Please
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refer to the Replacing the lamp section.
Make sure you have removed the lens cap and the projector is
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switched on.
Partial, scrolling or incorrectly displayed image
Press "Re-Sync" on the remote.
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If you are using a PC:
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For Windows 95, 98, 2000, XP:
1. Open the My Computer icon, the Control Panel folder, and
then double click on the Display icon.
2. Select the Settings tab.
3. Verify that your display resolution setting is lower than or
equal to UXGA (1600 x 1200).
4. Click on the Advanced Properties button.
If the projector is still not projecting the whole image, you
will also need to change the monitor display you are using.
Refer to the following steps.
5. Verify the resolution setting is lower than or equal to UXGA
(1600 x 1200).
6. Select the Change button under the Monitor tab.
7. Click on Show all devices. Next, select Standard monitor
types under the SP box; choose the resolution mode you
need under the "Models" box.
8. Verify that the resolution setting of the monitor display is
lower than or equal to UXGA (1600 x 1200). (*)
Appendices
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