Macbook Pro starting up in different resolution after connecting to LG TV

Hi,
Recently my dad used my Macbook to connect to our LG TV. After the connection cut down, my laptop screen down to that resolution with black bars on the bottom for like 1sec. But now every time i shut it down, and turn it back on, the screen with bars pop up for 1sec. i did reset PRAM but that didn't help. Any advice greatly appreciated.
Thanks
Stella

Hello
There has been a long sequence of messages here about the "No Wacky" problem encountered by MBP's when woken up while a 2nd display is connected. This problem has apparently disappeared.
If I read well, you're talking about powering-up your MBP. You're not talking about "returning from sleep"?

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    Default Browser: Version: 600 - SDK 10.10
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    CANONiMAGEGATEWAYDL: Version: 3.1.0.2 Support
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    CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
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    ZoomUsPlugIn: Version: ZoomBundleVersionNumber - SDK 10.9 Support
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    Audio Plug-ins: ℹ️
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    Java  Support
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    NTFS-3G  Support
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    Clinton

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