Since you're running a PowerPC based system, you'll definitely want to have the following version of Flash Player installed.
However, I suspect you're running into problems with content providers blocking playback on this older version. Unfortunately, I don't have any official good news to give you. The version of Flash that supports PowerPC is no longer supported. Unofficially, some members of the public have been able to work around this problem.
I followed the letter of the intructions exactly, twice, to no avail. Still no video. Interactive content, yes, but no video. I even tried installing the latest version of flash afterwards. No luck.
Would someone else with a PowerPC Mac and flash give the linked video above a try?