Q: i have an install disc stuck in a g5 that wont power up is there anyway to get it out

Hello,

If all else fails,like holding mouse buttn down on bootup...

Other than that, you can slide the door of the optical downwards with your fingers, then use a straightened out paper clip to push into that tiny hole to eject the tray.

https://discussions.apple.com/docs/DOC-1015