Bought this to replace a water-damaged Thinkpad T450, thinking a refurb T450 should be an easy swap.Got it up and running but the controls to control screen brightness were missing.Adjustable brightness is essential for my dyslexic child.I did all the updates, dug into the settings, tried various tweeks - never once in the hours of fiddling did I suspect some uber-cheap refurbisher would install a screen THAT DOES NOT HAVE ADJUSTABLE BRIGHTNESS!!!What bin of obsolete tech did they dig this crap out of???I only figured out the problem when, in desperation, I started downloading apps to control brightness for multi-screen set-ups - and each said the screen was not capable.WARNING: Amazon refurbs cannot be trusted.