My laptop won’t detect my external gpu

Jan 8, 2018
2
0
510
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I have a Dell Inspiron m5040 and I added an external gpu and my laptop won't detect it and when I go to the bios I can’t go to the graphics devices setting to change it to switchable so please help me someone.
 
Jan 8, 2018
2
0
510
0
Yes I have tried that already and it says that there is unknown hardware and it won’t install and one time it installed my old driver that was already on my laptop
 
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