PowerBook G4 starts but only displays a white screen

Rich99622 Posts 1 Registration date Thursday February 14, 2013 Status Member Last seen February 14, 2013 - Feb 14, 2013 at 07:29 AM
my powerbook G4 displays just a white screen and stops there...
Sometimes it displays the apple icon on againsg a white background and stops there..I have tried almost all the commands and combinations i have read but the problem persists upto now..
Please any one help me..am doing my research and all my data is there..Have no back up and am really confused..