Either... Take out the battery and put it back in or Wait for your DS to die, then charge it. (personally, I like #1 better)
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Turn your Nintendo DS off. Then take the game out and blow everywhere on the back and blow where you put the DS game in. After you do that, put the game back in and turn it on. It won't be frozen anymore. Or for an easier way turn it off and turn it on again.
Sharpeaustin: make sure that the battery is charged then turn on the ds using the switch on the right. Spearer: You have to mail it in to Nintendo for them to fix it, I think
Your DS was probably screwed. Try replacing it, or send it back to the store to fix it.
You can try buffing the scratches out, though you can always get a screen cover for your DS.
Blow on it 3 times.if that did not work then try taking the ds card out of your ds and put It under a tap!hope this helps :-)