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Is the PC going into sleep mode at all? My laptop does this if the mouse or keyboard hasn't been touched for a while...
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Thanks for the reply.
found out that Samsung have something called power management system built into there sets which switches into hibernation mode after a certain period (screen is black and the red power indicator flashes every 1 second).

but up to last week it was on 5 hours a day and it never went off once:confused:
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might just be on certain inputs?... ie VGA?