PakOne :
USAFRet :
What should you consider? Does it work? Are there any dead pixels?
I wouldn't buy a second hand monitor for primary use unless I could see it in operation first.
Ok, how old should it be at most? 2 years old? Should it have DVI or HDMI connection? or with VGA it's ok?
Age is irrelevant. What connections it should have depends on what connections you need.
DVI or HDMI is better than regular VGA.
What are you connecting this to?