Gaming DSi not booting

[Wooaw2005]

The inner parts of the small switch are corroded. Pressing the button has no effect – the corroded parts don't conduct electricity.

Blowing into the button and brings moisture in there → Bang. Switch works… until it dries up again. But there is one problem: Saliva is corrosive as well. In the long run it will destroy the small metal plates and – if you blow like mad into the DS other parts may corrode. Seriously: Don't do → that. Yes, it is worth reading the initial post of this thread.

Ok, I'll keep that in mind.

If the problem persists, I'll try getting a brand new replacement switch or ribbon cable assembly thingy.

 

[Wooaw2005]

The issue appeared again but this time I'm going to use WD-40 to hopefully dissolve any corrosin or gunk.
(Obviously removing the ribbon beforehand)

 

[Wooaw2005]

WD-40 is now my favourite DS repair tool

 

[de-coder]

2 black screens? use a sd <=2GB (fat32, 16kb cluster, primary partition) - typical error i had many times

 

[Wooaw2005]

2 black screens? use a sd <=2GB (fat32, 16kb cluster, primary partition) - typical error i had many times

My SD card was 2gb. The issue is now fixed, but thanks for your feedback!