Ok, this is a very strange and frustrating problem. I'm not sure if it's hardware or software. I recently bought a Mirror Door Dual 1 Gig G4 from my work for $300. I thought this was a good deal. I was able to get a new 250 gig internal hard drive and I maxed out the RAM up to 1 Gig. However, I’ve had a recurring problem ever since I upgraded to Tiger. Actually, might have been there before, too. After I log in and the finder starts up, more often than not I notice that the clock in the upper right hand corner doesn’t show up. When this happens I’m not able to use any system preference panels and most of the programs that are closely linked to the OS. The pointer just endlessly spins. For a while I was able to get it to start up correctly by adding or removing a RAM chip or chips. I’ve tried every combination of chips so many times that I almost totally ruled out the chips themselves as the source of the problem. As of late this hasn’t worked to fix the problem either. Also, sometimes it won’t start up when I press the button in the front of the tower. The power button lights up, but nothing happens. If I turn the power supply on and off it usually fixes that problem. I wonder if the two problems are related. If anyone has ever heard about anything like this please let me know. I would be eternally grateful.