: Look for "white spots" or dead pixels that only appear on bright backgrounds.
: Never buy a laptop if the seller can't prove it's unlocked. A BIOS password or an "Activation Lock" can turn a laptop into a paperweight. is buying a used laptop a good idea
If you'd like, I can help you find a specific model or compare deals if you tell me: What is your ? : Look for "white spots" or dead pixels