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Random blank screen for 1 second

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We have a Dell Inspiron N3700 running windows 10. Bought it new. The display goes off and immediately back on at random times.  It will happens both when the PC is idle and in the middle of typing (in fact it just did).  We have changed monitors, changed inputs (DVI, HDMI and even VGA), changed power cables, had Dell support on the phone for hours updating drivers and troubleshooting, and finally sent it back to Dell where they changed the motherboard.  And still we have the problem.  Any suggestions?

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