When I turn on my DSi, it shows: An error has occurred.

Hello, I have a DSi and everything was fine. To enable more options, I added the connection, and a month later I was playing New Super Mario Bros when suddenly it shut down. I took it to a repair shop, and it was fixed. The game card was replaced. Note: Most of the games are 3DS games. A few weeks ago, when I click on the game icon, a message appears: An error has occurred. Now, when I turn on the DS, it now displays: An error has occurred. Turn off the console and consult the manual...... Every time I try to turn it on, the same message appears. My DSi won't turn on anymore. Does anyone have a solution?