Nintendo 64 quit after using a gameshark

Your memory card may attacked by virus. You can try four Card Recovery. You can download it freely.

Personally I'm not sure where you can buy them but many cheat sites have lists of gameshark codes for games (including pokemon ones) just try googleing it also try poket monsters as this is also the pokemon games

I know mine didn't work,so i took it to a pro. He cleaned i thoroughly and it worked after that.He said 6 out of 10 of them are dead , but luckily mine just had really dirty contacts, top and bottom.So I'd recommend taking it to a pro, but first try different games with it ,sometimes it just gets stuck on a keycode.
http://www.hotcheats.com/gamesharkkeycodesnintendo64.html

you need to load up the proper key code so the game can load. Only certain games need this.

Hi mabodnark,
Try these> Unlock all levels and helicopters - Enter R, C-Left, Right, Up as a password.

Level Password

10 - L, Up, Left, Down
11 - L, Up, Left, Up
12 - L, Up, L, Down
13 - L, Down, Up, Left
14 - R, C-Left, Up, Right
15 - C-Down, L, Down, Down
16 - R, C-Left, Right, Up

The original GameShark for the N64 only works on certain games. During the N64 era, game creators would often include code on the game itself that prevented the use of a GameShark. It is possible that you can find a newer version of the GameShark that would work with this so called "blocked" games, but it might be difficult.

I'm assuming that this is the GameShark Pro for the N64. If so, the button is used to find and create your own cheats, such as infinite life, infinite ammo, etc...

To use this feature, start the game, say a first person shooter, and load into a level and when you are ready to begin playing, press the button. The GameShark screen will show up and you can say "search for code" or "search for changes" something like that and the game shark will run a diagnostic that it shows on the screen. A number will appear noting the number of lines of code executed since the game loaded. When it is finished, press the button again and it will return you to the game exactly as you left it. If you are trying to get infinite ammo, simply shoot once and press the gameshark button again to search for codes again. When it is finished, the number it shows will be much smaller, since much less lines of code have executed since the last run. Press the gameshark button again to return to the game and continue the process until you have only a few, say 5 or less, or even just one code left on the gameshark diagnostic. This code will be the one that dictates the amount of ammo that you have. By altering this code with the gameshark, you can either start with an extremely high amount of ammo, or have infinite ammo entirely. The key to this strategy is to do as little as possible between code searches so that you can quickly narrow down on the code that you trying to alter. Hope this helps.

Try to say an supplier. Search on google the site and the suppliers.
Peace!

YEA SOME CODES INTERFEAR WITH ONE ANOTHER SO TRY ONE AT A TIME TILL U FIND THE ONE THAT FREEZES UR GS I HAD THE SAMEPROBLEM

put in oe of the working games and go to keycodes hit the A button and you can scroll through a list of games that need keycodes. Select the game and then turn your N64 off and then put the game you selected in the gameshark and turn it back on, it should now work

after you load up 007 you must go to key codes to select your game. Then you turn it off and put that game in. It wont start again if you put the wrong game in so dont screw up. Then you can select cheat codes.