Hello All: When I tried to boot my dual 1.8 ghz Powermac G5, it does something very strange: After pressing the power button, it displays the blue network globe on the screen in a small grey box. This flashes for about thirty seconds, then switches to a folder with a question mark, which flashes question mark, Finder logo. Then, it goes into the grey apple startup screen, where it stays until I turn the computer off. The G5 is running 10.5 and has 2gb of RAM installed. When I select Macintosh HD from the startup disk selection screen - I got to it by holding down option on boot - the G5 goes directly to the grey apple startup screen - no network symbol or folder. I have not used this computer for 2 months. Thanks in advance.