The clr cmos jumper/button resets bios defaults. What CPU are you using?reseting the bios requires being able to see it, or at least clear cmos. i tried clear cmos/reset bios button with the gpu out, power on, and gpu out power off. both options failed to swap it back to integrated.
So you do get a display on the monitor with the Ubuntu drive in? What error does that show?I do not have a second graphics card, and i know my cable is likely good because if i stick my ubuntu flashdrive in, the error message will show.