B320 Display Blinking

After inactivity, my B320 frequently enters a state where the display blinks ON and OFF with an approx 1sec interval.  During this state, the PC appears to be usable (mouse, keyboard, etc work fine...) its just not practically usable.  The LEDs in the bevel at the lower right corner of the screen also blink, but the HDD, BT and WIFI LEDs do not.
The only resolution I've found is restarting.
So far I have updated the Intel driver and tried different resolutions, to no avail.
I'm not entirely sure how to trigger this, but it consistently happens when the display turns off due to inactivity then I come back.
This is a 6mo old refurb B320.
Any thoughts?  Thanks, Nat

The problem just occurred while my B320 was in use, so it is not a result of inactivity.
Another user reported this problem, but it is unressolved: http://forums.lenovo.com/t5/IdeaCentre-Desktops-Home-Servers/Desktop-B320/m-p/768243/highlight/true#...

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