How do I stream music from non-iTunes apps to Airport (mac air core-i7 OS 10.7.5 airport firmware 7.6.1 --- option-clicking speaker icon only shows internal speakers - audio streaming works from iTunes just fine.
I did not read the rather long post. If you wish to reinstall OS X 10.4, use your software install DVD. Backup is essential. To minimize your risk, I would use an archive and install:
In that way, you will have a fresh copy of OS X and your current settings will be preserved.
Incidentally, I do not agree that the printer problem is best solved by reinstalling OS X. I have had HP printers for sometime and, on one occasion, had difficulty after an upgrade. HP technical support walked me through uninstalling all traces of the HP driver and then reinstalling.