G5 ten times to open the computer can you help ?

My G5 is always not working well. I have ten times or more to open it and work with him. At the beggining I saw finder with question, and after few times, nothing. It takes a long time to open Mac OS X. I did hardware test nothing wrong. I reboot with first disc, nothing change. Do you have an idea to find a solution. I bought a external hardware to save my files.
Thank you I was sure Apple was better than PC but if I don't find a solution, I'll think its equal ! If you've encountered same issue, please help.

Hi Quick time pro issue,
did you ever do some system maintenance: Mac OS X 10.3/10.4: System maintenance?
For your problem, try this first: MacOS X 10.4: Basic trouble-shooting

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