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Zbook 15 won't power on

HP Recommended
ZBook 15
Microsoft Windows 10 (64-bit)

I have a Zbook 15 I am troubleshooting for a friend. I am not sure what generation as the tag on the bottom is all but worn off.

The unit will not power on at all.

When I plug in the power cord, the power light and caps lock light come on for 1-2 seconds and then go off (simultaneously).

I have tried a different AC adapter.

I have removed the battery.

I even removed the battery, RAM and hard drive, but I get the exact same results.

Does anyone recognize that light behavior as a code of some sort that indicates the issue?

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