If brand new means within 30 days of shipment, you're better off returning the system either for replacement or a refund.  Dell does not troubleshoot by send-in.  You need to do the troubleshooting while on a call or chat with a technician. You can run the diagnostics (F12 at powerup) but with a defective brand-new system, replacement is a better idea.  
Our brand new Inspiron 15 3525 screen kept freezing shortly after startup. Sound would still play, and if I plugged in a monitor through the HDMI port and had the project setting set to duplicate, the monitor would be active (really laggy), but the laptop screen would still be frozen. Tried a fresh new install of Windows 11 but it still froze. I ended up booting into safe mode and no freezing. I begin to disable all the drivers in safe mode, then booted back into normal mode and enabled until the screen froze again. I ended up finding the problem to be the 31.0.12028.2, A02 AMD graphics driver that is shown as the newest and most up to date graphics driver for this laptop. I installed an older AMD driver, 30.0.13036.2, A01, and no have screen freezing. Had to disable Windows 11 automatic driver updates because it kept re-installing the bad driver. Is it possible this is still a hardware issue and we should send the laptop back to Dell to diagnose and fix?
Inspiron 15 3525, screen freezing