My initial thought was that the monitor had broken so I tried the monitor on a different computer and to my suprise it worked fine.
I thought then that it must be the graphics card, so I fitted in my backup graphics card. Again I was still getting the red/purple screen.
this tint is even visible on startup and in the bios.
i was wondering if anyone could give me any guidance as to what is causing this as I now have no idea what it could be.