So yeah the power adapter not working. Can it be fixed at all or should I try to get a replacement?
Since you are asking the question, the answer is 'try to get a replacement'.
A.
They are pretty expensive. I bought a used one for my 23" and it was $100.
Yes, they are kind of rare. I wonder how long mine will last - I keep it standing on end so it runs cooler, but...
A.