Same thing happened to mine... from reading about on the internet, I heard it was a common problem with these boards for the 2 solder joints in the top left to fail which is where mine was all black. To save myself a bit of cash with a new board, I took a soldering iron to it - just resoldering the two joints again and it did the trick and board works fine now. That was about 3 months ago and still going strong.
Jamie
July 2008