I decided to do a cleanup of my storeroom and i found this super old computer and monitor that i thought i could maybe try to sell for cheap. I plugged a DVI cable from the Graphics Card (NX8800GT) to the monitor (Syncmaster 226BW from samsung) but i only saw a blinking square at the top left corner switching between (Digital) and (Analog). Shortly after it would say Check Signal Cable. I tried unplugging the DVI cable and plugging in back in but to no avail. Any answers?