I've accidentally disabled my onboard graphics through the Device Manager. I got a black screen, and so I turned my computer off. I saw that I should remove the CMOS battery on my motherboard after finding nothing in the Gigabyte BIOS so I did so. It was hard to remove, so much so that I just pushed it back in the little bit that it came out and to my surprise after rebooting it said that my BIOS had been reset though the battery had barely gotten out of its holder thing. It asked me to click choose optimised settings and reboot and so I did but I still have a black screen, please help!