Pokemon Platinum Rom Only Works Once?

So.. when I first downloaded it and used it with my r4, it worked great. Then I saved it, and turned it off, but the next time I wanted to play with it again, the screen just goes blank white. How can I fix it? :(

Well the fact that you said "R4" is your whole issue ha ha. I guess the best you can do is backup your contents of the sd, perform a format, and copy all files back and try again. Trust me from personal experiences: R4's are a rip off. hardly worth your money. I suggest an Acekard 2 :)
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It could even be a fake R4.

Make sure you have the latest firmware. http://linfoxdomain.com/ds/ And try padding your save-file with this tool. http://anandjones.romulation.net/files/ds/4to8mbittool.rarOtherwise, use YSMenu. https://www.romulation.org/forum/index.php?topic=27617.0

dont go for the well known cards like TT and R4, also like at their website and check for any news about fake products i suggest M3 Zero i aka M3i Zero or for DS lite to save cash M3 DS REAL , there mainpage is www.m3adapter.com

i have a problem similar to this, i play pokémon, save it then quit the game... when i come back to the game there is no continue game option =[ im using a supercard ds one btw