Have a Dell 2200 MP w/609 hours on lamp. Several weeks ago a darkening band appeared on left edge of screen from top to bottom. Not a sharp edge but graduated affecting about 1/8 of the display. In about 3 months time this band grew to cover about 1/5 of the screen. Today I removed the lamp to inspect it and the projector. All appeared OK. Immediately after re-installing the lamp the area affected grew to cover almost half of the display. Replaced lamp with a back-up and after re-installing I've lost 3/4 of the image and after going back to the original lamp the entire image is impossibly dim. Image is sharp and color seems correct but too dark. Tried a reset to factory spec's to no avail. Any idea's? This Noob thanks you in advance!