MBP 15' i5 2010 Model + vga adapter and projector issue

Dear All,
my MBP always got screen crash (green / purple screen) when i use a VGA adapter in miniport to projector,
I have to hard reset. it's strange that, after rebooting, it doesn't crash when I connect to the projector again.
but next time when i connect to project, it crashes again
i tried different VGA adapters, still the same.
any ideas?
Thanks a lot!

it was ok if i connect to my Dell Monitor
but crashed at the first time when connecting to any projector

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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
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Effect: After connecting to a projector I get a projector picture for approx 3-5 seconds.
After this time the projector loses the signal from the iPad2.
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Copied from the link you provided with troubleshooting steps for this.
If you are still unable to turn Wi-Fi or Bluetooth on or off after attempting these steps, contact Apple or your wireless carrier for additional assistance.

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MBP 15' i5 2010 Model + vga adapter and projector issue

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