What display adapter, i.e. video card, is in it now? Or, does the computer use onboard video (meaning no add-on video card; the display adapter is integrated into the motherboard)? If you now have an add-on video card, did the computer originally use onboard video?
Does this nVidia item (an "unknown" item) appear under Display adapter in Device Manager? And, does another, valid, display adapter appear there, also?
I do not think clearing CMOS will change this?