My IMac M1 will not power up

Check the Power Source ( Wall Socket ) is functioning.

If your Mac starts up to a blank screen

A blank screen (black, gray, or blue) should appear once or more during startup. If your Mac appears to be stuck on a blank screen, follow these steps.

Try to start up from macOS Recovery

If your Mac seems to be turned on but nothing appears on your display, determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Press and hold the power button for about 10 seconds.
2. You should see the startup options window, which includes a gear icon labeled Options. Select Options, then click Continue.
3. If you never see the startup options window, release the power button, then press and hold it again for another 10 seconds. If the issue persists, please contact Apple Support. 

Intel processor

1. Press and hold the power button for about 10 seconds.
2. Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image.
3. If you still see a blank screen after about 20 seconds, contact Apple Support.

Use Disk Utility to repair your startup disk

If your Mac successfully started up from macOS Recovery, you should see a utilities window that includes Disk Utility. Use Disk Utility to repair your startup disk.

If Disk Utility found no errors, reinstall macOS.

If Disk Utility found errors and repaired them, restart your Mac. If the issue returns after restarting, reinstall macOS.

If you still need help, please contact Apple Support. 

Suggests below

Please - one may get better Assistance if Posted in Big Sur versus High Sierra - for future purposes

Start up a Mac with Apple silicon in safe mode

1. On your Mac, choose Apple menu  > Shut Down.
2. After your Mac shuts down, wait 10 seconds.
3. Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options.
4. Select a startup disk.
5. Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.

Apple Silicon M1 Computer Recovery Mode

1 - Choose Apple menu > > Shut Down.

2 - Press and hold the power button on your Mac until you see “Loading startup options.”

3 - Click Options, then click Continue. 

4 - choose an appropriate offered option

Use Apple Diagnostics to test your Mac Apple silicon

My M1 iMac just completely died. Apple Tech support (Who was fantastic BTW) suggests its a failed logic board and will need to be sent back for repairs. It was already pending return due to a dead pixel but now its back in the box since I cannot power it up anyway. The problem is I have a presentation on Tuesday that I have been preparing for all week and since I have not saved it to my iCloud Drive, I will need to re-do it as we cannot recover the files off of this iMac.

And to add, I need to wait up to 4 weeks without a computer since they need to pick up the old one and confirm receipt before they send out the new one. I find it a bit unfair considering how much I paid for this iMac.

In this situation, what can consumers do but wait?

I wonder if I was a "valued" client if Apple will do the same and let me wait.