I'm having a really strange issue with my P35Xv3 -- the internal display stopped working with the BIOS and Windows 10 completely...both work fine on an external display (hdmi or displayport). Seems like a simple hardware problem, right? So I replaced the lid/lcd assembly and it still has the same issue. On a whim, I booted an ubuntu-gnome live USB and halfway through the boot, the internal display lights up and works perfectly, even after unplugging the external monitor. But it still doesn't work with the BIOS or Windows 10. I've tried everything I can think of -- toggling Fn+F5 (though it should've worked in the BIOS regardless), updated the BIOS, pulled the battery and CMOS battery and let it sit overnight, disabled the dGPU in the BIOS, etc, etc. The CMOS battery is a steady 3.1V so I don't think it's that. If anyone has any thoughts about it, I'd love to hear it. I've emailed Gigabyte support but I don't expect much there other than 'send it in' and I'm well outside the warranty so that's a last resort.