Hi SuperMario94,
Welcome to Sony Community!
We regret to hear that the laptop won't detect the external monitor. Kindly visit this link to help you out with the issue, http://docs.esupport.sony.com/pc/VPCEG2_EH2_EJ2_EL2_EK_series/EN/contents/02/07/04/04.html . If the issue still persists, you may follow the steps in this link, https://us.en.kb.sony.com/app/answers/detail/a_id/39626/kw/cant%20display%20on%20external%20monitor/c/65,66/related/1
To reset the BIOS to the default values, https://us.en.kb.sony.com/app/answers/detail/a_id/44078/c/65,66/kw/how%20to%20reset%20bios%20
Regards,
Jen
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