Hey peeps. when i try to open a CD (like my ipod installation CD) my Mac says 'there is no default application to open "ipod dmg"?' and gives me the option to choose an application or cancel... i know it shudnt do this because its onlt recently started happening. and also, i dont know if this is a seperate issue, but when i put a blank CD in it says something along the lines of 'this CD cannot be read by this computer, although ive used the same brand CD before and also tried others. Also, lately, when i put a DVD in my Mac, i have to find the DVD player manually?? it doesnt open it automatically anymore???
I'm in help of a real genius, thnx for any help thats given.

