(Specs are: 800 MHz/1 GB RAM/ 60 GB HD - running OS X. 10.2.4) After putting my TiBook to sleep, on occasion it will not wake when the lcd is opened and gives me a series of five quick bright flashs of the lcd sleep indicator with an accompanying series of beeps. (almost like an SOS signal!) On two occasions I did this and got the familiar Mac start-up chime tone but the system did not boot? On another occasion it booted to the os X spinning circle but the system locked and had to be restarted via the power button. Most of the time it will boot fine. Any clues as to what's up? -- Joseph Fisher --