Why does it say that there' no ds card inserted

There is most likely a problem with the connectors in the DS or the cartridge. Try putting rubbing alcohol on a q-tip and cleaning the DS Card's connectors (don't drench it). Let it dry completely before putting the cartridge back in.

If you are inserting a DS card, be sure there are no foreign articles inside the slot. Blow into the DS card slot to clear any debris. Also be sure you are inserting the card all the way in until it clicks. I've also found that if you're powering on a game, and you bump, grasp or touch the ds card as the DS is powering on, that can cause it to not read games.

Check the actual DS card itself and carefully look at the exposed contacts on the circuit board. Be sure none of them are scratched, damaged or otherwise. A scratch can damage a contact, thus preventing proper data read.

If anything was spilled onto the DS card, be sure it is thoroughly cleaned with a damp cloth (no cleeaning chemicals!) If you immerse the DS card, or pour liquids on it, that may damage it as well.

Same points hold true for inserting a Gameboy Advance game (if you have a DS or a DS Lite. The DSi and DSiXL do not have Gameboy Advance slots.

If you turn on the DS and nothing happens, try a different DS Card. If it only happens with that one particular game (or games) your DS cards are damaged or need cleaning. If all your games are not playing, there is a problem with your DS. Try your games in a friend's DS just to make sure. You'll probably have to send the unit to Nintendo for repair, or take it to an authorized repair center.

ok here shake the ds card if u feel something moving yhen it means the card is somehow spoilt

Slot 1 card reader probably has a bent pin. Not a nice job to DIY.

Try inserting it while the DS is turned off.

the sd card could be scratched or maybe you laft th DS in the car. (the death of most cardreaders.)

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 don't know what wrong but if you ask a friend to put it in theirs to check if it your nintendo ds or just the game

there is an error with the ds itself, you will have to get it sent off for repairs or find a nearby gaming repair shop

turn it off, take out the card. then reinsert and try again