Hi all
i recently upgraded my osx from 10.5.7 to 10.6.3 and i have managed to INSTALL snow leopard with success. However im unable to go past welcome screen and log in my registration details because the on board keyboard is not working, And also that all my usb ports are not working at all so that i can use them to connect mouse and keyboard. please help im new at this really and any help will be much appreciated.

Thank you so much in advance

my laptop specs are