Hi I have just bought a gt60 and have been trying to calibrate using a THX blu ray or DVD. Firstly tried Avatar blu ray as it has the THX logo on the box but I've been through every setting option and cannot find how to access the THX screen. Thought it may be the disc so checked THX website list of THX films, bought Alien on blu ray and DVD (again with THX logo on box) and tried again but still unable to locate THX screen to calibrate. Beginning to think either this THX is a gimmick or I must be missing something really obvious but tearing my hair out as specifically purchased gt60 as advised it is THX certified and can calibrate picture. Please advise and provide idiots guide to using THX bluray or DVD !!!