My GF dropped her phone on the carpet and cracked the digitiser (the back part). So I ordered a new one from eBay which arrived today. The 'new' screen doesn't light up or anything. Can I assume it's a dud or is there any sort of set up procedure I need to go through to make it work? I would have thought that it's a plug and play kinda thing.

The new screen looks slightly different in terms of the position of circuit board thingies on the back. The connectors are in the correct position. It was advertised as for the Treo 650.

I don't think there's anything wrong with the Treo because the old cracked screen still lights up when I connect it up....