I've been using my PC happily for a while without problems but I recently used the Gtweak software that came with my r9 380, I naively turned the oc speed all the way up. Immediately my screen went black, now whenever I start up my PC it shows Windows loading etc. but as soon as I try to log in the screen goes black. The monitor is still receving signal however all is see is black. I've tried reinstalling the drivers and so far nothing has worked, has anyone else had a similar problem,Mehta can I d to fix this.