I know there are a few posts already about this but. This is a little different. I have an 08 SLT2 with Navi and it dont work. The Navi doesnt work it says DVD read error 7 out of 10 times. I have had it to the dealer and they have ordered different DVD's and have updated the Navi software. Do any of you have any suggestions? The stealership is lost they first thought it was the Navi unit so they replace it. That didnt work so they thought that it was the DVD so they ordered a new one. That didnt work so they ordered software to update it. That didnt work. So they are lost they ran out of things to replace and it does the same thing. I have had this thing since June and it hasnt worked. There has to be a logical answer other than LEMON. I love the Acadia but 7 out of 10 times it dont work and the 3 times it does it will get so slow with the directions you will be past the offramp before it tells you. PLEASE HELP.