Hi I am having trouble with my iMac G5 rev. A for about a week now it has trouble booting up and freezes when it finally does boot. I have ran disk utilities from start up disk and everything works there also ran hardware tests and again everything good. The only thing that I can think of is that I loaded firefox browser and then decided to get rid of it. I have very few 3rd party apps examples like Onyx, mactheripper, windows media player and small ones like that, anyways when I first try to boot up for the day the screen will stay black (but you can hear the computer working) then the screen will go bright grey and then fade into black again, after that it will go to a blue screen like it wants to boot and then freezes. I will then have to hold the power button to turn off and repeat until I decide to just safe boot. Safe boot works fine but I want to use all of OS x. I have 1 gig of ram matched. when I finally get it to boot in normal mode and it doesn't freeze as soon as it goes to sleep mode it freezes. This is the first mac that I have ever owned, but I know a little bit, so bare with me.