Nintendo DS Lite Green Lite, Pop, Won’t power on

Hi!

When DS systems turn off with a pop, it usually means that something isn't connected properly. Make sure that all your ribbon cables are seated correctly, especially the one for the top LCD, that one is a pain to put back in correctly.

If reseating all your cables doesn't fix the issue, maybe check the top LCD ribbon, and i mean the whole ribbon, not just the connection. You said you can't see anything that you may have damaged, but it is very easy to damage the ribbon when rolling it and getting it through the hinge.