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I don't have a T90 or an FD lens, so can only guess what this means. This is quoted from the T90 manual:
"When you use the stopped-down AE mode with the FD lens, do not push in the stop-down lever with the lens set at the "A" mark. If you do, "E" marks indicating an error will appear to warn you of incorrect operation (EEEE EE in the viewfinder and EEE on the display panel), and the shutter is locked.
In this case, either push in the stop-down lever again to clear the stopped-down AE or remove the lens from the "A" mark. The error display will then disappear."
The stop-down lever is on the lower left front of the camera, and is what is usually now called the "depth of field preview" button. The "A" mark is the setting on the lens for fully automatic aperture control.
befor going anywhere change vga cable between pc and projector.-and run video source from anywhere and check colour mismatch.if you got mismatch from both pc and video go to menu and make some correction to colour . if all failed you have to pass it to service center.