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I'm NOT starting this thread all over again but my monitor restarted the '2 long, 1 short' light pulses tonight. Must be time for another ride in the car. RATS!!!
Ah...zee old intermittent hardware issue...bane of any electrical engineer (ask my hubby)/repair person; guaranteed to magically disappear when the item in question is delivered, in frustration, to the local repair shop or the repair person comes to you, and just as magically, show up some time after the trip home/repair person leaves.

My stove did that to me recently...though it seems to have cured itself (fingers crossed) - meanwhile, the Sears repair guy thinks I'm nuts.
It may be time for a new monitor - did they give you any idea of the cost of repair when you took it in?