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I replaced my light and opened the back to clean out the dust but now my picture has shifted to the right of my tv, how can I re-adjust it back to center?

when you opened the back to dust you might have moved or shifted the optical block / light engine (with has the projector lens) to one side, I would reopen it and make sure all corners are flush with the mount, or if it has a slide our tray, that both ends meet inside..