Hi, I'm not sure what the problem is, but here are the symptoms: My dad is using an iMac G4 desktop. For some reason, every once in awhile, especially upon Restart, the screen shows all blue except for a small blinking square in the middle, with the network symbol in it. I know what it means when there is a blinking question mark, but what does it mean when there is a blinking network symbol? In trying to get it to restart, and unable to get the CD tray to open, I removed all of the peripherals. That didn't work. I plugged them back in, but turned off the printer. When I turned the printer back on, the Imac started up. But, that doesn't always work. Any ideas? Thanks!