The idea of trying an alternative display is a good one that will help you isolate where the problem is occurring. That way you can save a lot of time by locating the issue in the box or the display.

Another option is that I can send you a troubleshooting flowchart in pdf format that will let you follow through several troubleshooting processes in a systematic fashion. PM me if you like with some email details and I'll flick the flow chart through.

Cheers,

Andrez