|You need to load the graphics driver if you have not already.|
You need to go into your BIOS to make this setting (read manual online/download PDF file). If you have the option I would select 'disable if PCIe graphics card is present' (or something similar) for your onboard graphics. This will allow you to be able to access the onboard graphics in an emergency by just removing the graphics card, otherwise you will need another card to even test the system if you think the card has gone bad. Many system BIOS' do not have this option but if you do have it, it is worth setting it.
You have to be a little bit crazy to keep you from going insane.