I appreciate the reply.

Any computer can get a virus. While the MAC unix based OS kernel is more secure than the Windows OS, MACs can get viruses. In fact, Apple just released a patch this week to secure a vulnerable part of Java that made MAC users susceptible to the Flashback Trojan virus. Mac users have been lucky since nearly all the viruses are target toward Windows computers.

Apple releases Java patch to thwart virus

I do agree that Malware probably does not want to announce its there by a ringing bell. Mail and all programs are shut down and I stopped all processes possible in Activity Monitor. Still hear the bell. I am sure its a background process of some short running.

After scanning the internet I only found an old post of a iMac G5 user with the same problem, but no one offered a solution. https://discussions.apple.com/thread...art=0&tstart=0

While I appreciate the essay, I have been a Mac user for over a decade since the G4s. This problem is puzzling...

Anyone else have any ideas? Its annoying.