If you're talking about the lights at the front of the computer, not on the top by the monitor, then you may have a problem with your power jack. The tray icon for the charging status will also fluctuate from charging to not charging. The power jack breaks loose from the motherboard and is easily repaired.
Probably your wireless modem. There should be a little switch to turn it off. Check your manual.
What is the symbol next to that light?
If it is the Hard disk light that is considered mnormal when the PC is on - especially if you are running VISTA
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