Yes. It has all the disks... And i renewed the operating system once but the problem persists... When i try to run a dmg file, first it says that the image has been inserted successfully. But then, nothing happns... I mean, an installation or smthng shld begin but nothing happns. Does anybody hav any idea.. And sorry for the spamming.
Installations don't happen automatically. Once the dmg is opened, you'd have to either copy the program to Applications and start it from there or run the installer, if one is present on the dmg.