Powerbook -can't start up in single user mode or from CD-why?

My daughter was gifted a Powerbook (15"). I've upgraded it to 10.5.8. It has enough speed, (1.67 Ghz), 2 gigs RAM- but it is a sticky little machine- it freezes a lot. Froze twice during the upgrade, froze once during login, Froze once while trying to do a software update, froze once while trying to get into the system preferences. It freezes pretty consistently after 15-30 minutes or so, no matter what it's doing -if a program is running or not. I tried downloading AppleJack to run a diagnostic. That requires starting up from single user mode. I tried to do that , but the machine just opens to the login screen. I also tried running TechTool from the CD, and the machine wouldn't start up from CD either. What should I try next?

Try this one for some information.

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    Sofiya Li
    TechNet Community Support

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