Made a video in iMovie which is large 203 mb but it's not playing in Quicktime tho it's a quicktime file. I am running 10.9.5
help
Powerbook G4, Mac OS X (10.0.x), One of the first models that came out.
You cannot run 10.9.5 on a G4 PowerMac!
What versions of OS X and iMovie do you have?