Hacking Case Swap - now DS Lite won't start up

[mp3boy]

Ok, so I started off with:
Pink DS Lite, perfect case, dead motherboard - the power switch broke so it won't turn on
Black DS Lite, powers up fine but has a cracked hinge

I've swapped the cases over using the Shock disassembly photos (http://www.flickr.com/photos/62647765@N00/sets/72157594277451148/) - I left the top halves as they were and just disconnected the ribbon cable and swapped the whole unit over.

I now have a pink DS Lite but when I go to switch it on the green light comes on, the speaker clicks, the top screen flashes white then it all goes off again.

I've tried swapping the black top back on - same problem. It's not the battery because that works fine in another DS.

I was very careful with it (I've been repairing ipods all week and they are very fragile) but it seems I've still gone wrong somewhere.

Any suggestions on what to check would be greatly appreciated.

Thanks in advance
Chris

 

[mp3boy]

Problem solved - it was the pink bottom screen, swapped it for the black one and everything works again

Edit: maybe not

every time i get it back together it just goes into the 'flash once then die' mode. Tried 2 different motherboards, 3 bottom screens and 2 top screens now. What am I doing wrong?

 

[4saken]

Something is loose. It could be the bios, microphone cords, etc. The DSL checks to see if everything is online before booting to the main screen

 

[Shinji]

also make sure youre not pinching any ribbons...

 

[lenselijer]

you need to check all the lcd connectors, when only one of them is not properly connected the ds will not boot up.