Lost my start up disk

i have g5 running slow. have never done maintenance on , running slow. in efforts fix issue downloaded onyx clean , before starting there message me boot macosx disk. have looked , looked disk. can find old g4 system software puzzles me. must have lost disks came g5 , not disks previous power mac.

q: how make start disk system on computer? or can i? running macosx tiger on powerpc g5

thank help
maria

 

i may have correct powermac start disc. pm have? dual core or dual processor , cpu?

 

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