I have an ACER Aspire 6930 laptop computer. Last week, I performed a "re-install" to get rid of malware. Since restarting the computer, one of the back-lit symbols above the top row of keys has been flashing orange, every few seconds. The symbol looks like either a spinning-top or a television dish. It is the symbol above the Num Lock key. What does this indicate and what action do I have to take? Thank you.