I have an early Imac Duo Core with MacOS10.4. I lost the orginal DVD and have purchased 10.4 on CD's. I have been having problem starting up the computer with the cd's? Is it possible to do so with the cds or should I buy a 10.4 DVD? Therehas been a problem with hard disk. I think that it is very close to capacity in terms of containing files. I have been able to start the computer with Diskwarrior and it has been used to do maintenance on the disk. However, I can't open the hard disk when using Diskwarrior either.