I recently bought a new iMac, well a new used iMac :/, I installed OS X and it keeps asking me for the region of the DVD and I have 4 tries or sth like that. Will that affect my ability to play DVDs from the USA and such? If so, I'm on my third try now and I want to keep playing ALL my DVDs ... 
Grtz,
.frederik-jan

Grtz,
.frederik-jan