Z420 constantly power cycling.

[Aomething]

I recently patched a Z420 running Windows 7 (64-bit). I restarted the computer, and then the issue started.

The system turns on (Blue LED Power button, DVD drive spins, etc.)  after 1-2 seconds it shuts down, waits 5 seconds, and then starts again. If I remove the power plug, it still tries to start up again. It fails (becuase no power) but the LED power button  turns red and a BEEP code sounds off. The BEEP code varies between (3) options:  2 Long, 2 Long & 1 short, and 3 Long. After many tries to identify I can tell the BEEP code is completely random between the (3).

The only thing that does seem "off", is that the PSU fan sounds like it is struggling for that 1-2 seconds of activity.

Any thoughts?

[Grzwacz]

Greetings,

Welcome to the forum.

I am not a HP employee.

What patch did you apply?

Your PC's chipset is from Q1'12. I am guessing your PC was manufactured in 2012 or 2013.

This HP Support site list BIOS error codes for various HP products (Link). I don't see any specific beep and LED blink error codes for PCs made before 2015 that exactly match your description.

There are some LED blink codes and some combo error codes.

Regards