How do you test refresh rate interlacing?
When I scroll down/up on a certain page with animated gifs, there is a black shadow persisting around those gifs for a second on mine. Is that the problem?
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how do you check the manufacture date?
The interlacing is really obvious to me. It's like vertical running bands on the display. There's loads of topics about that on these forums, including a wallpaper which you can use to test it.
But don't go looking for it if you can't see it.
For the manufacture date, this is the link http://www.chipmunk.nl/klantenservice/applemodel.html
Just pop your serial number in there and it'll tell you the manufacture date.