Black Screen Everytime The Imac Restart or In Sleep mode

Guys i really dont know what to do more..

I bought the new imac 1-2 years ago, and it was perfect!

I'm a student so it took me alot of time to get this one /:

After a while my imac sudden turns black screen ! Like the brightness is Not even exist! While i using it

I can turn a flashlight and bring it to the screen and see it all works! And there is no light inside!

After i reboot the imac, my new good imac was black screen everytime i restart it.

I realised when i plug out the cabel, and wait 25 min, and plug in the power cabel agian, the imac sometimes

Turn my lights screen agian, and sometimes i need to wait more than 30 min to use it agian.

After doing everything! I went to idigital (my apple store in my country)

And the engineer said that the screen is damaged or the lights stopped working.

They tell me they need to switch the whole screen (display)

And pay more than 500$

(In my country it's so Expansive !!! And i'm student.. i need the computer for studies

And cant pay for this :/)

They sent it back without fix it.

This is not my fault, the imac came broken, or bugged.

I was in shock it happend to me

I really need help :/

I heared apple can bring me code or something to fix my new imac,

It will make me so happy i really dont know what to do..

Please help me 😟

I'm desperate ....

Daniel