Hi, I recently acquired a PB G4 12" 1.33GHz. It has a strange problem. It will power up just fine (with chime), boot to the gray apple logo with spinning progress disc and so on. But when it gets to the point where the login window is supposed to appear, I get a blue screen with a mouse arrow. The weird thing is, I can still type my username/password, press enter, and it will log in (even though the screen is still solid blue). After logging in, I can press the power button and then enter to shut the machine down. When I boot in verbose mode, it displays everything normally except that the blank screen still appears when the GUI starts up. When shutting down the system booted in verbose mode, the screen will change from its solid blue background to the black screen with white text indicating "syncing disks... killing all processes... CPU halted" and shut down normally. Booting to single user mode and removing all GeForce and NVDA kexts will make it boot to the login window with graphics, but the system hangs about a minute after logging in. It will display the spinning beachball for ~20s before freezing, but holding the power button down for 3-5 secs will shut it down. The copy of Leopard on the machine was clean installed with another Powerbook (15" 1.25GHz) and the hard disk has no problems, since the disk boots Leopard every time it's installed in the 15". I've given as much details as possible, but if I have missed anything, feel free to tell me. Thanks in advance!