Nintendo L and R button do not function.

I think it can be fixed by repairing the button ....you can fix it yourself or get you nintendo ds repaired from nintendo repair shop

The DS lite console does not have a way of quitting a game and going back to the main DS menu.
The only way to quit a game completely would be to save your game, and press the power button on the side of the console to turn it off, and then back on.

Take note that you cannot change game cards while the system is on, or it may cause damage to the game and/or your system.

OK the buttons are probably dirty. I had this same problem with my DS. Pry open the outside edges of the buttons until there is a gap. Blow into the gap while making sure you dont spit in the console. This should clear out the dirt and make your buttons work.

Hi Susan,

It is possible that the volume button has slipped off of it's setting on the switch below it and that while you think you have turned the volume up it is only partially turned up.

If it is a new DS bring it back to the shop (12 month warranty on new DS systems) they are obliged to repair or replace the DS.

Easily repaired at DS DOCTOR

most L & R button faults are micro switch faults, require stripping down and testing.

You can play multiplayer games with a Nintendo DS Lite even if you don’t possess a copy of the game. If one of your friends has a multiplayer game card, they can use their Nintendo DS Lite as a host for the game session and you can join the multiplayer game.
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Things You'll Need:

• Nintendo DS Lite

Using One Card to Host the Game
1. Step 1 Look on the game’s packaging for the "Multiplayer" icon. If the game requires only one player to have a copy of the game, the icon will show two DS Lites: a DS Lite with a black screen transmitting waves to a DS Lite with a white screen. Below the two DS Lites is a range of numbers which indicates how many players the game can support.
   
2. Step 2 Put the game card in the Nintendo DS Lite that is acting as the host for the multiplayer game session and start it up.
   
3. Step 3 Have the other players turn on their systems. They will use the main menu screen to access the "DS Download Play" icon. They need to tap the icon to begin downloading the game information from the host DS Lite.
   
4. Step 4 Begin playing when all of the systems have finished downloading the game information from the host.
   
Multiple Cards for Multiple Players
5. Step 1 Look at the "Multiplayer" icon. If every player in the game session needs a copy of the game in order to play, the icon will show two DS Lites, both with black screens, transmitting waves toward each other. A range of numbers is under this graphic and indicates how many people can play at one time.
   
6. Step 2 Read the game's instruction manual on how to set up the game session. The steps required vary by company and sometimes by title within the same company.
   

*reposted from ehow.com

Take a q tip and wet the end. then you rub the crack between the button and the actual ds the dry it off and blow on it really hard three times

the only i would do is GET A NEW DS LITE.

From looking around, you can get replacenet parts for the DS. Its a little tricky though. Do you have any friends that mess around with building and moding computers? They may be able tohelp you