guylhem : I don't think it's a fuse issue ... but thanks anyway for the attention.
I found somewhere on this forum a description that got my Z to go into service menu (all other descriptions failed on my device):
Take out the batery and leave it out,
Take at least a 5 second pause,
Press and keep holding D and M keys on keypoard,
Push in the power chord while pressing the keys,
Let the keys go and wait a few seconds the service menu should come up shortly,
Put the battery back in close cover and lock.
I then attempted to restor original nand flash backup that can be downloaded from
http://trisoft.de/en_slc760.htmBut after having nand flash restored the device it still fails to boot.
I restarted the service menu to do a flash cksum only to finf out that :
ROFLSYS is in state NG
PRESET is in state NG
Anyone have any ideas how to fix this ?