PERC 4/Di warning: Embedded RAID firmware is not present

Hello,

I have a Dell PowerEdge 2600 (running Windows 2003), whom the RAID controller PERC 4/Di appears to be faulty, I continually get the message "Warning: Embedded RAID firmware is not present".

I've bought a replacement kit (used), I obtain the same warning!
I've found some information on the web, but nothing help me to correct it, it's possible that it comes from the motherboard.

But before to forget the RAID option on this server, I open this post with some screen shots attached, in case someone have a solution!
For example, is it an option to reset/reinstall the BIOS or something?

If not, I've a second server which is identical, whose RAID works well.
Can I take the PERC 4/Di components from this second server, and try it on my broken server?
That could help me to check if the problem comes from PERC or not!
But, it's very important that this manipulation will not unset my current RAID settings on the second server... and  I can not afford that second server no longer works after having reinstalled the PERC.

Thank you for your help,
Chris