Brand new imac stuck on startup screen

Hello,

I was setting up a network when the system of my brand new iMac (4 days old with about 6 hours of use) froze (beach ball of death)

The only thing i could do was to hold the power button on the back.

When I turned it back on the white bar was stuck on 10% aproximately and i kept waiting but nothing happened. I pressed command+alt+P+R turned it off, waited for 10 seconds turned it on again. Same thing happened.

Then I turned it on and pressed shift, the bar got to about 25% very slowly and then froze again.

Then I turned it on while pressing D, diagnostics said no problems were found. From there I went in to safe mode (only safari worked)

Rebooted, but again: the bar gets stuck on 25%.

Is my brand new iMac broke?

(iMac specs: 27", 1TB fusion drive, 4GB graphicscard, Corei7, 8gbRAM)