SOURCE: Toshiba TE2100 blank laptop screen
Try holding the Fn key down and then press the F5 key a few times, waiting a few seconds each time to give it a time to switch between display modes.
SOURCE: how to set up multiple external monitors on a laptop
Since you only have one external monitor port, you need to use a video spillter, this will allow you to connect two or more external monitors.
NOTE: This video splitter will only give you duplicated displays. Please check the link below:
http://www.kvm-switches-online.com/video-splitters.html
Thank you!
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