I recently bought a new monitor an Asus VE248H ( http://www.newegg.com/Product/Product.aspx?Item=N82E168... ) while setting it up I've tried getting it to work with two different graphics cards, an HD4750 and a GTX460. I have tried HDMI, VGA and DVI from the graphics cards to the monitor. I've cycled through all the monitor input settings and they all displayed no signal.
I know the monitor works properly because I plugged it into my PS3 via HDMI.
His way is the first way to try and it will work every time. I have a dell INSP 570s and when I added a card the instructions I was given was go into device manager click on display adaptors then click on on board graphics click on properties then click on disable. Only if plan one doesn't work. The bios is the easy way to do it and good luck to ya