when i turn my 10.4.11 mac (build 8S2167) on it always shows me a white screen for about 2 minutes, then in the middle of that white startup screen it shows a slowly flashing earth. i can fix this by unplugging the hdmi internet from the computer. but it has recently started showing a flashing folder icon instead of a flashing globe, it takes 3-4 restarts for the computer to get past this even if the internet is unplugged. whats wrong with my computer, is it a virus or just a software/hardware glitch? how can i fix it