I bought a manufacturer refurbished ASUS VS239H-P monitor and plugged it in first trying DVI and then trying HDMI, and both resulted in the display saying "VGA no signal" when I turned on the monitor. I have it plugged in to a Radeon HD 7950 (the card worked fine with my 24'' Viewsonic LED). Are there some drivers that I need to download before it'll work, or do you think the monitor is defective?