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Monday, June 01, 2015

Error 512 - rear chassis fan not detected on a Small Form Factor

as per hp site:
"Although the HP Compaq 8200 Elite Small Form Factor PC has no rear chassis fan installed, this error message may arise when the front panel cable assembly was damaged after a system repair attempt.
In a HP Compaq 8200 Elite Small Form Factor PC, Pin10 on the front panel cable connector is used to tell the system BIOS, that the chassis is a Desktop model, not Microtower model. This is necessary because the system board is also used in HP Compaq 8200 Elite Microtower PC, which has a rear chassis fan installed. Pin10 is not connected there.
If the cable on Pin10 of the connector in a HP Compaq 8200 Elite Small Form Factor PC was damaged accidently and therefore has no connection to the system board, the BIOS assumes that it is a Microtower model and therefore checks for a rear chassis fan."

There is a problem with the front panel connector:

Let's remove it and look, the pin 10 is not connected while pin 5 (usually unused) it is:

We just need to remove the plug from pin 5 and move it to pin10:

Finally the ground is moved from pin 5 to pin 10:


  1. Two thumbs up!!

    You absolutely nailed it!

    That fan error if thing has been bugging me for a year!

    Following the steps above, all you have to do is pull the one black wire on the end of the connector out and then inserted into the empty receptacle directly below. To get the wire out of the harness, use something like a sewing needle or a small eyeglass screwdriver to lift up on the harness tab and then the wire will pull right out....

  2. Great live hack, error 512 no longer appears. Very good advice.

  3. Works with a SFF ProDesk 600 G1. Used jumper extension wires and a small HDD jumper to connect the ground wires of Pin 8 and Pin 9. This is the only post I've seen (of about 30, including videos) that posed this successful solution ...

  4. Thanks a lot! I was seriously looking for a spot where the syst fan should go. It worked great on my HP Compaq 6200 Pro SFF.

  5. Worked perfectly, thank you! The hardest part (for me) was getting the pin locked back in place. Had to make sure it was turned the right way.


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