Hi all. Got this gpu in a cheap sale as not working. I've tried different cables, 3 different motherboards and 3 monitors. All have same results. Fan on gpu is spinning and pc appears to post ok but the screen is blank. When I say blank, monitor indicates that a signal is getting through (power button green) but stays blank. Should I take apart and maybe replace thermal paste? Fan a little dusty. Not sure what else I can do.