benq fp91g+ (q9t4) monitor not turn on

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Joined May 13, 2010
benq fp91g+ (q9t4) monitor. Mostly wont turn on. Once in awhile it does
and works fine. However, that's very seldom. The on off switch hot side
is 3.3vdc. The switch grounds that when its pressed and my dvm then
reads 0vdc. Every time. Ive traced it to the display circuit board
plug, gray wire. So, it goes from 3.3vdc to 0vdc when the switch is
pressed - Every time. Over and over I can do this and every once in
awhile, the unit powers up and it works fine. however, the next time,
it wont power up.

Any ideas what could be wrong? All the caps look fine. Ive also
inspected all solder joints.