It's dead Jim.

How to reset the SMC of your Mac - Apple Support

Be sure to follow the procedure exactly. The keys with the same labels but one the other side of the keyboard are not wired in, and will not do the job.

teichholtz wrote:

Walked away from my Macbook Pro 15" 2018 for a couple of hours. When I came back, it was completely dead. Power button does nothing, No fan, no sound, no keyboard light, no touchbar light, nothing on screen. It is as if someone took the battery out of it. I verified that the charger is working, and indeed, I have a second charger and used that! Again, nothing. Zero. Tried while plugged in to the charger, tried while unplugged from the charger. Nothing.

I've tried the 'start in safe mode, reset NVRAM' things. Nothing.

Any ideas?

"Mistah Kurtz—he dead"

ref: Joseph Conrad's Heart of Darkness - Wikipedia

Mac notebook, contact us and we'll send you a box you can use to ship it to an Apple Repair Center. We'll return your repaired product to you as quickly as possible. Depending on where you get service, you might be able to check the status of your repair online. Start a service request https://support.apple.com/mac/repair/service

Call Customer Support (800) MY–APPLE (800–692–7753)

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

If you’ve charged it overnight with a known-good charger, and have performed the SMC and NVRAM resets, you’ll then want to avail yourself of the Contact Support link in the upper right and have a discussion of your options with the folks that work for Apple.

One long-shot possibility.

Disconnect all external devices, storage, displays, everything other than the charger.

This on the off chance that some external device is causing issues.

See if the Mac charges over several hours, and try your resets and reboot again.

Failing that, call 🍎.