My PowerBook G4 is coming 3 years old and recently it has problem such as Volume Disabled, Slow Connectivity etc. And the main important thing is it opens up program very slowly and something it hangs. And my mail has problem sending out, usually it takes less than a couple of seconds but this time it takes overnight and something it doesn't even send! I seriously have no idea of how can I diagnose the problem. Even my dashboard has problem to start up as quickly as before. Can anyone help? Does anyone encounter such problem??? My PB is G4 running at 1.6Ghz, OSX 10.5.4 with 1.5 Gb of DDR SDRam. Thank you.