I was watching a video on my 2011 MBP, when my computer suddenly froze with the graphics messing up and the sound got stuck on repeat. I had to restart, and now every time I turn it on, it gets stuck halfway through, the load up bar disappears and the computer gets stuck on a white screen. I've started safe boot but it doesn't work, trying to start with up with my partition doesn't work either, screen just goes black. Any recommendations? Unfortunately I don't live in the US, so I can't have a genius appointment as idk if that graphics replacement thing is available for me as I live in South America and bought it in another retail store.