Thank you yoouumadbro. Actually, that's what I did. I mean, not the silly solution with the cloth bag. Instead I had the GPU reballed by someone on ebay located in Florida. I FedExed the motherboard, and it came back within two weeks, I put it back in the laptop and everything worked like a charm, including bluetooth [which was the original question on this thread]. Now I have a nice cooler pad to make sure that the GPU does not create a problem again, and I even changed the HDD with an SSD. NV53 is now fast, and perfect for playing minecraft ....
One more thing about BT on the NV53: my model did not come with the BT included, thus I now have a small BT dongle. BT works fine, but I don't know how to connect the quick switch BT button below the screen to the BT dongle ... if anyone know how to do that, that would be very helpful.