MBA mid-2012 does not see external display on wakeup

My mid-2012 MBA does not see external displays on wakeup. VERY annoying
I have a BenQ 24" HD display connected by HDMI and it is not seen by the Air on wakeup. I have to open the laptop, pull the mini-DV plug out 3 or 4 times before the display is recognised - some of the time. Most of the time requires a reboot with multiple cable/plug inserts.
What an absolute POS this mid-2012 MBA is! Apple finally fixed the garbage colours on external displays in 10.8.4 but the issue of recognisisng external displays remains. Its a crock. Totally regret buyiing this POS.
Have reset PRAM, SMS, cleared prefs etc etc ad nauseum. No solution with any of them. After almost a year of this garbage, the laptop is close to being thrown out as e-waste.

macbook pro 13" 2012
osx 10.8.4
adaptor
http://www.maplin.co.uk/mini-displayport-to-dvi-adaptor-454323
display: philips 230c1hsb
i have reset PRAM but nothing happens

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