I had an old Ibook G3 with the same issue repeatedly tried to get adobe to work but it would stutter or buffer for 10 mins on a 2 min youtube. Itried streming links through vlc but none worked. I sold it and returned to Windows and linux. Because it is so old ther does not seem to be a fix at that time. You could try to load a linux os on ther (not to familiar) but it works great with old pc's.