keep the iBook in heat of sun light 4 to 5 days and clean the system
coffee should be dry and remove the keyboard and check the it that the liquid dry also pass the current to another component. After this you on the Ibook
If there is Nvida Chip you have a problem. Because of the Nvida chip heat more compair to Intel and Ati. It can be Problem. You have search the chip level repair. there the heat the Nvida Chip and Press. It work in 90% computer.