Kind of a weird iMac problem. I have an original iMac G5, System 10.3.9, with built-in airport & bluetooth. In the middle of booting (during the spinning logo part of the cycle), the iMac just shuts off. Boom, like the power was cut. So I tried booting with the shift key held down, boots into Safe Mode without problem, but then I can't access my bluetooth keyboard/mouse, so I have to shut down using the power button on the back of the iMac. Now here's the weird part. After rebooting, everything works fine. But if I repeat the process - shut down normally, reboot - I get the catastrophic crash again. Not until I boot into Safe Mode, then reboot using the power key, does everything go back to normal. With the abrupt loss of power, I'd have to think there was a hardware issue, but I can't explain the workaround noted above. Any ideas? Thanks, Dave ps - since when did the term "Safe Mode" come to the mac? Last I tried to troubleshoot (years ago) it was always "extensions off."