Can't start a new game

I recently borrowed a copy of Pokemon White for Nintendo DS from a friend who bought it used, so there was already a complete game on it. I used down + select + B to delete the game but whenever I try to play it it would say:
The save data could not be accessed.
Please turn the power off and reinsert the game card.
I have tried doing this on my 3DS, as well as my old DS lite but when I attempt to play the game the same text will come up. I'm not very tech savvy so this might be some thing obvious and if so sorry for my ignorance.
Best Answer
Probably you are pressing the wrong buttons, try instead: up+select+B
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Why wont my PC let me play games?
If you are having trouble getting a game to work on your PC, the most likely issue is compatibility. To troubleshoot your PC's compatibility with a game, first check that your computer matches or exceeds the system requirements. Next try updating your graphics card's drivers, or updating DirectX.Why will my game not load?
Having trouble loading the games? This may be because you have an older or corrupt version of the game in your browser's cache, which is the information sent by a website and stored on the user's browser so that the website can view the user's previous activity.Can - Mother Sky (1970) [HQ]
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