Originally Posted by iDartveder
I was installing a ROM called XperiZe or something like that and I installed it via CWM 6.0 and it was working but then I got a error message, then I restarted it and... Bam, black screen. I got a nandroid backup.
You did maybe try flash a Custom ROM that was NOT compatible with your phone model. Your /system and/or (maybe) boot partition (Kernel) are overwritten, it means your phone is without OS system. Try USB jig to access download mode.
A important note for you, mate. If a installation process failed in recovery, do NEVER reboot your phone, restore your backup instead!!