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Try turning your DS power off then let it cool down for a few minutes. Before that take the game out. When you've let it cool down for a few minutes put the DS game back in and see if it has worked.

Try a nintendo approved DS Card in the system, if you can't get that to take then you know the slot in the DS is bad and the DS needs to be replaced.

If you can get a nintendo approved DS card to work then you know that you need to stay away from the 3rd party cards.

i had a ds since it came out and now my ds dosent work so id say ur ds is old so u shud get a new one

It might be a defective battery. Try putting the new battery in a DS lite that you know works. If the other DS works with its own battery, but doesn't with with your battery, then your battery is most likely defective.

Or you could take the battery out of a good DS that turns on and can do everything, and put it in your DS. If your DS still doesn't work, even with the other DS's battery, then your DS might be broken.

no the ds lite is a smaller version they will be to big on a ds. there is another kit for the ds