What is the problem when laptop is running in safe mode but not in normal mode

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hello,What is the problem when laptop is running in safe mode but not in normal mode.i use sony vaio laptop.my problem started when i clicked the projector option without connecting to the projector.after this blank screen appears.

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19532
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Wednesday October 8, 2008
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Contributor
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June 15, 2019
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This sounds like you have activated the external monitor via the Function key and deactivated the built-in screen. The solution is to use the same function key to reactivated the screen.

Good luck