You can overheat the box with towles etc (see You Tube) but this will only last a few days before it goes again.
You are better sending it off - took less than a week for mine to be picked up by UPS, sent to Germany, new board, new DVD drive (replaced by Microsoft as they said it was a bit wonky) and returned by UPS with a months subscription to X-Box Live for the inconvenience. Online tracking all the way so knew exactly where it was and what stage it was at - piece of piss.