Ok, a little background. I have a lenovo L420 laptop and bought an EGPU adapter via Express Card. I used a Geforce GTX 1050 TI In order for this to work you need to first disconnect any egpu external device and perfrom DSDT override to your system. Very easy guide thanks to user 'angerthosenear' found here (JAVA MUST BE INSTALLED IN ORDER TO RUN .BAT FILE. Other wise nothing will open) Keep in mind step 5 on his tutorial was a bit off. The correct code should look like this: