Hi I have a problem in my new iMac computer 21.5

Dear There,
I want to inform you regarding my problem with my first iMac 21.5in, It is in the screen, actually the problem is the backlight after several minutes the screen come a black as like turn off and if I make reboot there is no thing change and still the black screen so it have to do let the iMace 2 days turn off to able see the screen work again but the problem come again..
I guess that problem come from :software or hardware !!!!???
So could you please tell me how can I fix this problem .
Thanks

Hello Saad,
I believe that the iMac issue is only a matter of SMC, once SMC and PRAM reset and connected via Thunderbolt to external Display the issue resolved.
Both video and backlit is restored on the iMac and on the external Display.
Best Regards,

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