Client just shows black screen

So my client just shows a blank screen, I've tried everything I can think of and I must've uninstalled and reinstalled about 5 times with the hextech repair tool, this is what my screen looks like when I open league ( however I can hear the background music.. Multiple times when I've patched I've been told files are corrupt even though it's a fresh install but even when I install and I don't have the files corrupt pop up it still appears like this. I've switched to a public DNS, run as admin and done some others things support has told me but it's not working... Any help would be appreciated :)

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