Hello i need groovymame help

[Immortalhate666]

So i follow the guide on andys youtube,,
I have a dedacted mk4 cab with a crt in it so i switch type to arcade 15.7 in vm maker and do my configs in there i enable
The EDID emulation mode the lcd screen turns black i hook tje jpac up to my arcade crt tube and i get nothing but a black rolling screen? Not even windows...since the drivers in emu mode now when i hook back to the lcd to see i did wrong its just a black screen to fix i have to put in vga mode to diable the gpu crt driver..also byw im using a old jpac not the newest one with the usb plugin..i just want this to work on my crt tube thanks guys.

[darknezz19]

Use a second monitor or install teamviewer and log in with another computer. Often for some reason it doesn't set 640x480 as the default desktop resolution for me and  have to set it manually.