Alright, so I've only had my Powerbook G4 for a few months. I decided to install the updates I needed. I checked, and the usual Ipod and few others showed. Then the new OS X 10.4 update showed up. I installed it, and then rebooted. When it loaded up, I had no finder bar or any desktop icons. I can scroll through my apps bar, but when I click on an icon, it doesn't load up. What's up?