the lamp is running too warm from inability to cool down. clean out the dust with canned air and check the fans. the temp sensor may need to be replaced, as the heat may have desroyed it.
when you say its cutting off the image, do you mean it is blanking the top and bottom off the picture. Is the image that is displayed on the computer the same as on the projector or is it just a cinemascope version of the computer screen
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