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SalSimp
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HP Z840 - Adding Electronic Serial Number (ESN)

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Z840
Microsoft Windows 7 (64-bit)

My motherboard died and I bought a used replacement. The replacement board has the ESN from the machine that had been trashed and sold in parts. It works great but the serial embedded in it is different than the one in my workstation's case.  On the Z820 you could change it in the BIOS (Ctrl-A in the Security menu) but the same procedure does not work in the Z840. I just want it all to match. Any ideas?  TIA

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Paul_Tikkanen
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Hi:

 

That is very odd that the control-A method doesn't work.

 

I have attached the old electronic serial number programming tool that works on many HP business desktops.

 

I know it worked on models up to and including the 8100 Elite CMT (made around 2010), however I have no idea if it will work on the Z840.

 

You will need to use a USB FDD, and probably you will have to run the utility on a XP computer for it for format the floppy disk and make it bootable.

 

It cannot be run by any other means.

 

Other than that, you would have to take it to an authorized HP service center and have them tattoo the BIOS with the serial number on the case sticker.

SalSimp
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Thanks for taking the time for the response. I have tried it (the app) but it does not work ... it appears modifying the ESN has been turned into a 'write once' option. Control-A, I have been told, works only if the ESN is missing (blank), as in a brand new board. Once it is iserted then Control-A does not work any longer. Surely there must be a secret set of keystrokes to modify it in the event of input errors.

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Paul_Tikkanen
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You're very welcome.

 

Sorry that tool didn't work for you.

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joselso
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Z840 should still be under 3-year warranty by HP, so if the motherboard 'dies', expect HP Support to provide a brand-new motherboard at no cost, and then it is the responsibility of HP technician to insert the correct serial number and other system-specific info' that should be included in the BIOS.

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