I had a similar issue with my AW 17R4. No power button light display, etc. I was able to force it to boot into bios a few times but it would never get past post. 

Motherboard was replaced today. It took about a month to get a replacement part (my MB is a little different than yours, i7-6820HK and GTX1080). 

We tried reaching you on a private message asking for the Service Tag number to ascertain the warranty but did not receive a response. Please feel free to reply to the private message whenever you are available.

Im facing the exact same issue, what was the outcome?

Were you able to solve it, did you replace the motherboard?.

Also @DELL-Cares what can be done to get in contact with someone about this?

Thank you

Have you tried power draining the laptop and making sure everything is cleared out before booting? also i recommend doing a BIOS reflash as this can probably be a false positive (based on the laptop turning on).

@Alienware Area-51 ALX 2006 thank you for the tip, I did try that with both the clrp1 connectors and reconnecting the cmos battery.

However it didn't work, the issue persisted until it no longer provides any response.

It seems like this is a weird issue in a some laptops when they enable tpm for windows 11 insider preview.

Hopefully I'll be able to salvage this laptop.

Hi @AqeelHashim  thank you for sharing update. 

BIOS will not allow POST to complete without TPM handshake with original TPM Windows 10 or TPM Windows 11 (C:) boot disk. 

Windows 10 (and Windows 11) will take ownership of the TPM automatically unless Windows 10 (or 11) is specifically instructed not to take ownership. This is a security feature that disables PC function if stolen and a different OS(C:) boot manager is installed to try and restore PC function. Only the original owner can get PC working again. TPM unable to change between 1.2 or 2.0 because TPM is owned | Dell US 

The TPM ownership needs to be cleared before the TPM firmware update can run correctly. How to Successfully Update the TPM Firmware on your Dell Computer | Dell US 

Dell service center does not have the ability to undo the TPM changes you have made. Even if you can produce evidence of ownership, Dell service center should respond as if the PC was stolen. 

Update to Windows 11 problems are not part of the Windows 10 Dell warranty. 

Please click on Kudos to say thank you for response from user that is not employed by Dell. Please share an update on progress, so that other users derive benefit from your experience. Thank you. 

Try this:

Turn off the laptop all the way.

Open up the back panel.
Disconnect Battery cable from the motherboard.

Disconnect CMOS Battery.

Remove RAM by holding it from the sides.

Remove All Harddrives and Boot Media.

Hold the Power Button for 20 Seconds.

Reconnect Battery and try to turn on laptop.

If it flashes that means no RAM and no CMOS is installed which is good.

Then disconnect the battery and hold the power button again for 20 seconds.

Plug CMOS Battery and One RAM Stick in any slot (preferably the first one).

Then Plug Battery back into motherboard and turn on the laptop.

as soon as the alienware logo starts keep pressing F12 and enter ePSA.

Hi @gamejutsu do you still have the original TPM Windows (C:) boot drive to try and get your 17 R4 to work? If your motherboard's security feature refuses to be unlocked or has been corrupted, a new motherboard is your only option. 

Please share an update on progress, so that other users derive benefit from your experience. Thank you.