3 specific fuses you're interested in: all in the instrument panel fuseblock, RDO IGN, ILLUM, CTSY LP. If they're good - then you'd have to pull that overhead console down & pull that 9 pin connector out of it. (do NOT probe any other wires than what I mention in that connector - trashed computers may result....) Checking with a test lamp connected to a good ground, in that connector, the Orange wire should always have power, dark Green has power when key is in RUN or ACCSY position, and the Gray has power if the headlights or parking lights are turned on. If everything has checked out so far connect the test lamp between the Orange and Black/White in that connector (it's a ground). If that ground checked out go to the bone yard and hunt for another display.
2000LT Blazer 4x4