Hi there, recently my AMD Radeon HD 7870 has been crashing, causing my sound to freeze and a pattern to come up on the screen. I tried reinstalling the drivers but that solved nothing. Yesterday, the driver crashed again ut when I restarted, my monitor said 'HDMI NO SIGNAL', leading me to believe that my graphics card is gone for good. Does anyone know how to fix the graphics card or alternatively force the PC to use integrated graphics, bearing in mind I can't see a thing on the monitor?