Mass Effect 3 crashing before credits

I bought and played through mass effect 3 (On PC i must add) and all have worked fine, no crashes or issues until the very end. I picked the synthesis ending which caused my game to crash and now every time i boot it up i get the control ending, with the synthesis part where the crew emerge from the ship and then my game goes black, but the music keeps playing but nothing else (the game is not necessarily crashing, simply failing to load and i can do nothing but attempt another re-boot )

not the greatest description but if anyone else is having this issue id appreciate some help in trying to fix it