Yes, I was booting with a LCD PC monitor and then changing cables as needed. Booted with CRT attached and worked fine, problem solved, thankyou
If you still need to check my modeline.txt for developing, bug free, etc say and I post it, if it was just for help me, problem solved.
In the other hand I don't want to boot at 31khz to avoid damaging the monitor, but if I use a real arcadevga windows gets blank screen, so I was thinking if I flash the 9250 I'm using into arcadevga and edit the IDs of the bios to match the name of the original 9250, should it work without the need of changing drivers or something in the same setup I'm using right now?