RMA that poo ASAP fool!
on the iMac, I managed to get that madam in the day before warranty expired.
Granted, I had bright lines on that display, but it seems a very similar fate.
As it was, the Apple store were shitty assholes every step of the way, and now the iMac suffers the mummy's curse, in that every bless'ed part in the machine passes inspection, yet the goddamn thing does not boot.
Do not put anything off, this merely makes decisions come down against your favor.
Get that poo out now yo.