Ya it's time to do the process of ilmination thing,unless you can afford those costly testers. Cheapest first the cable, then see if you can borrow a display or hook to a TV witha DVI connection, time to call in some of those favor's you loaned out way back when. And if those prove to be OK. It's either a dead card or a dead slot. Oh and if during the cable check or the display swap the display comes up check your driver if it's same one you installed and have been using before your troulbes started. If your not such when you do get it with good display make a printed copy of your hardware manager with all the plus signs open ( expand the whole file so you done miss any installed hardware or applied driver file and dates installed. Good Luck hope see the light so to speak.