Quote Originally Posted by Gallus View Post
you've clearly never heard a memory fault post code before. Of course, this would only be the case if the screen is black.
I have, but there's a distinct difference between a memory fault post code and an obstructed fan motor in terms of what it sounds like. Given the description the OP gave, it sounds a lot more like the latter, which is also significantly easier to test.

Edit: For clarity, the post code should be loud beeps, while an obstructed fan is a constant buzzing. I suppose it could be either one, but needs clarification from the OP.