[mythtvnz] Mythbuntu fails to start

[Paul]

My Mythtv box has developed a problem.

There is no display and it appears that the desktop has not started.

I can boot a live USB (Boot Repair disk) and it runs fine.The hard 
drives show no problems.

I've tried a monitor off another computer - same results.

The weird thing is that I have another cloned drive and it behaves the 
same it sounds normal during boot up - like it is loading stuff into 
memory etc.

I've tried to boot into recovery mode and to  boot earlier kernels.

I can use R-E-I-S-U-B command to reboot which indicates some parts of 
the system is operational but perhaps XFCE isn't starting.

I'm resigned to retrieving the database backup and various modified 
system files and  doing a re-install tomorrow - unless anyone has any 
suggestions that might correct the situation.

I'll check form any replies tomorrow morning

Cheers

Paul