undetected 512-rear chassis fan

Hi all

Today, I replaced a new cpu fan.
and the new, a work very well, but it is a problem, if I turned on my pc, I got a message from bios, this:error 512 - undetected rear chassis fan).
If I press F1 my pc will work normally and I see my windows 8

can someone help me please?

IHAVE: -.
Windows 8
hddr2 7168 mb of RAM
1 GB graphics card
convertible minitour of product name: hp compaq dc7800p
sysem bios 786f1 v01.32
Processor: processor intel (R) core (tm) 2 cpu 6400 2.13GHz

HP support is very bad!

I don't have any help from this support, because I fixed it!

Thanks for nothing!

Tags: HP HP Desktops

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