Originally Posted by
orinthia
I've done laptop screen repair a fair number of times, neighbors' kids destroying their screens in funny ways, and it's just buying a new panel on ebay for those. For desktop panels I can't imagine it being too much different, but you'll only know after you either find a disassembly manual or get a little brave taking a screwdriver to that monitor and get the screen part out.
You'll know it's a crack on the glass when you can view the crack from a different angle and different pixels are covered up. Crack in the panel means those specific pixels are screwed, and likely a whole lot more are messed up too, so the panel itself needs to be replaced (can range from cheap new-monitor amounts in cost+shipping). Plug something into it and see which it is.