Rank: Wiz
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You can sometimes find discs on the internet for failry cheap that changes the region of the disc before the disc loads. So you might try and find a "region changer disc" on the net.
Otherwise, lots of times, once a players region has been changed more than once or twice it will not allow another.
If you have already changed it back to region 2 and it is still not working, you might have a bad dvd player now.
Hate to be the barer of bad news.