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- May 27, 2012
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I recently had my iMac system updated to Lion 10.7.3. After bringing my computer back home and turning it on, I was unable to mount any USB sticks and all the sound was completely gone and unable to turn on. I tried to restart the computer and was greeted by a big circle with a lightning bolt through it. Has anyone seem this symbol before or know anything about it. I shut the computer down and unplugged it for 5 minutes and then restarted and the problems were gone. But I am worried about the lightning bolt symbols that appear. Does anyone have any answers.