How to reset  user and password of macbook pro os x version 10.5.8

hi,  I tried every option it does not worked for me. My machine is mac os x version 10.5.8  when I restart and press command  s or Command   R it goes to old log in page   when I type name and password it does not work. when I type, all the keys type number and symbols only.  and power on buttom does not response when f12 key pressed power on.
Battery condition is full, all hardware working, fan is working.
how to fix this issues

Back up your data, click here, and read the entire page. Mac OS X 10.7 and newer don't support PowerPC software such as Microsoft Office 2004.
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