Hi. I got me a problem. I have a PowerBook G4 15" 1.5GHz. Not too long ago today, I tried turning it on, but instead of hearing the comforting Macintosh chime, I hear three beeping tones and nothing appears on screen. Also the light on the front release button is blinking occationally. I've tried resetting the PRAM, holding down control and command with the power button, and even reseting the Power Manager. All to no avail. I have not installed anything new to the PowerBook last time it was working, so I am stumped. Any suggestions?