My system has been running fine until now. i just upgraded to the new version of iTunes and Quicktime. System Updater indicated that I needed to restart. I clicked restart. My system booted up and presented me with my usual desktop image, but there are no icons. After a few seconds, the screen goes blue and the system tries to restart. The desktop reappeears, but no icons. I cannot click on anything because my mouse pointer does not show up. The dock is showing up, and oddly enough, as the system tries to restart the desktop the clock is functioning fine. I am running OS 10.4.11. I tried a safe boot, but the problem persists. I am a college student who just started their year. I am in dire need of advice. Thank you very much.