Did this guide help you restore QuickTime on your Leopard Mac? Share your experience in the comments below or on the MacRumors PowerPC forum.

Leopard’s audio system conflict. Go to System Preferences → Sound → Output , click "Internal Speakers," then open QuickTime Player and press Command + J (Show Movie Properties) – check that the sound track is enabled.

Apple’s official support downloads (still live, but hidden).

quicktime 7.5.5 download for mac 10.5.8