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usb divices is poping up on my screen

usb keeps poping up every few seconds..I don,t have any thing pluged into usb ports

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If it says "USB Devices Disabled", zap the PRAM by:

Shut down your Mac.

Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.

Turn on your Mac.

Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.

Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.

Release the keys.

Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.

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