What does it mean when my computer makes a noise like a bubble popping?

if you have a crt "big old" monitor - it could have a carbon build up in the brushes - they go pop when they burn off - they usually dont do much damage though - but eventually it will just stop working.What does it mean when my computer makes a noise like a bubble popping?
It means you've received a popup window on your computer.What does it mean when my computer makes a noise like a bubble popping?
Electricity is arcing, jumping from one circuit to another, it will eventually fry the works and probably blow capacitors or worse.What does it mean when my computer makes a noise like a bubble popping?
With XP, it often means an information balloon has appeared in the bottom right corner. It can also mean a popup was blocked.