Video failures is usually described as the computer having no image on the screen at all. When servicing these problems, first make sure the monitor is working properly. Next step in the computer repair service is to make sure the computer unit is functional and powers up. Video card failure not uncommon, in fact early AGP video cards would frequently popped out of their slot. Video failure can also be due to motherboard failure so make sure to test out the motherboard. Also, when servicing these problems, make sure the video cable is functional. If you are noticing video degradtion, it often times, is the fault of the cable.