Take it apart. Clean it really well with Windex. Put it back together. Get back to me. Let me know what changed.

Hey,
So, I recently dug out this DS Lite I got at a thrift store for 8 dollars. It had the green light being on, but no screen activity issue, so when I turned it on, I expected it to be the same.

The screens lit up.

After a few tries, 10 or so minutes, it stopped again.

I noticed that it only ever seemed to work when I had it sitting in the basement (it turned on literally once before), so I threw it on the windowsill last night, because it was pretty cold, and left it for 20 minutes.

It worked again.

The Slot-1 needs to be replaced, but the slot-2 works fine, and it ran fine for a while, until it warmed up again.

I'm assuming it's some sort of connection issue, and the cold makes the metal contract, or something. However, it could be something totally weird that is totally beyond me (I'm not very good with anything to do with hardware beyond the basics).

Does anyone have any suggestions or comments about this?

Thanks.