Best Buy® does not fix Nintendo DS gaming systems. I would suggest contacting Nintendo to arrange for service on your DS. To contact Nintendo you should call 1-800-255-3700.

One difference between the Nintendo DS or DS lite and the Nintendo DSi is that the DSi doesn't have the GameBoy Advanced slot. Any Nintendo DS game that doesn't require the use of the GameBoy Advanced slot will work fine on the Nintendo DSi. Unfortunately the guitar grip controller for Guitar Hero game has to be plugged into the GameBoy Advanced slot and since the DSi doesn't have this slot your game will not work on the DSi. There is no adapter that will allow you to connect the grip to the DSi, but there is talk that Activision is developing a version of Guitar Hero for the DSi system. I hope this helps!

If your Blu-ray player won't play any discs I would suggest having it looked at by an authorized service technician.

You could contact the manufacturer, and they should have a list of authorized service centers in your area.

Another option would to bring your Blu-ray player to your local Best Buy® store and have it looked at by a home theater expert. If they determine its needs to be looked at by a service technician the Geek Squad® precinct in the store should be able to send it out for service.

If you purchased your Blu-ray player within the last year any defect in the player should be covered by your manufacturer's warranty. I hope this helps!

The GPS units sold at Best Buy® stores and on BestBuy.com do not have maps for South Korea on them.

If you are going to South Korea and are going to be in the country for a while I would suggest purchasing a GPS unit there. With the strength of the U.S. dollar in comparison to the South Korean currency you should be able to get a GPS unit there for a very reasonable price. I hope this helps!