Monitor not waking from sleep


i'm having problem mac mini monitor it's attached not wake sleep. not happen time, more not hit keyboard or move mouse , nothing happens monitor. if turn monitor off, on, can display back, it's annoying fix. i'm @ point i'd rather have black screensaver (which not energy-efficient).

else have same problem? monitor ~3 year old benq 24".

searched forums solution , found nothing of value.
 



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