a1419 late 2013 need help

[macman2020]

HI GUYS I HAVE A STRANGE PROBLEM SOMEONE FETCHED THIS IN FOR REPAIR SOMEONE HAS CHANGED EFI NOT SURE WHY I HAVE REPROGRAMMED IT AND CLEANED ME
SO IT LOADS APPLE LOGO AND BAR THEN THIS IS THE BIT I NEVER SEEN BEFORE THEY GO OFF HAS NORMAL BUT THEN LCD STAYS BLANK BUT BACKLIGHT IS STILL ON
AFTER ABOUT 1 MIN IT REBOOTS IT DOES THIS ON ITS OWN DRIVE USB AND EVEN RECOVERY RUN BUILT IN DIAGNOSTICS COMES BACK NO FAULTS
BAD EFI OR ME THEN WOULD JUST STICK ON LOADING BAR BUT IT GETS PAST THAT STEP ANY IDEAS THANKYOU

 

[snow755]

please do not type in all caps it is considered yelling on the forums thank you

 

[macman2020]

sorry