If it was me and my laptop had some sort of fault within the warranty period I would have got it fixed there and then as it might have been a sign that something else was failing.
That aside I think that since the one year warranty period is passed you are stuck with it. Contacting PB certainly seems like a reasonable idea, they might look at it for customer service but they have no legal obligation to do so.
I've limited experience with laptops, I have found them differcult to work with and almost impossible to repair personally.
If PB won't help then I'm afraid you have the two real choices you listed, find someone to look at it and see if it can be repaired, at whatever cost it will be for someone to look at it, or buy another computer.
Sorry I can't be of help but as the laptops over a year old as far as I know you have no comeback at all.
Sorry, maybe someone else will have an idea or perhaps a cheaper company who will look at it for you.