I have a 1 day old iMac with the i9 processor that refuses to boot; no display, does not appear on the network, does not phone home to the MDM, cannot remote into it. The fans come on and warm air is blown out. That is the only sign of life. I unboxed my new i9 iMac yesterday and proceeded to get everything set up. I spent 3 hours setting up my email accounts, getting Parallels running, installing Office and Creative Cloud, downloading iCloud photos, Dropbox, OneDrive, etc. It's a lot of data and it typically takes hours to get everything on to the machine. So I left it running at about 3pm and it last reported in to the MDM at 5:15pm. When I came in this morning, it was on but it was non-responsive. Tried to remote in but got no response. Held down the power button until the fans stopped and tried to boot up. Nothing. Tried resetting SMC and PRAM. Nothing. Tried safe boot and recovery mode. Nothing. One time, I was able to get the Apple logo to appear but no loading bar ever came up. It stayed like that for 15 minutes before I tried to reboot it again. It's very odd. I called Apple Support and they had me do most of the things I had already done. Nothing. They suggested I take it to the Apple Store but I let the agent know I would rather just return it and reorder. I am sending the machine back since it is well within the 14 day return period and I will order the same configuration as a replacement (i9, 8GB, 1TB, Vega). I just wanted to document my experience here in case any others see something similar.