What does a lightening bolt with another icon on the opening gray screen of a MacBook mean?

I turned on the computer which had not been connected to an electrical supply for a couple of days and I immediately saw a lightening bolt and another symbol instead of the Apple icon.  I have plugged in the computer and at first the green light showed on the cable for several minutes and then the light changed to show that the computer is charging.  I shut the computer down and left it off for hours to charge.  The light turned green on the power cord again and I turned the computer back on to only see the lightening bolt and other icon again.  What can I do?

Your computer has booted into "Target Disk Mode":
http://www.pinpointlabs.com/wordpress/2012/10/10/mac-target-disk-mode/
Look at this discussion:
Startup arrow with circle and y with circle in middle at start up

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