[MeganC]

I should say that I used the 2nd hard drive to get the RAID working and it is working just fine.

[Paladin2]

M/B jumper settings?

[Scutter]

Hi Megan -

HP has the service and technical manuals for all their computers online. I found what I think is the correct manual here. There may be something of use in there.

Also, I am not sure what processor was installed in the computer. If it was a single-core processor, then you will need to reinstall Windows to see the second CPU. Windows has two versions of the 64-bit kernel: a uniprocessor kernel and a multiprocessor kernel. The kernel is selected at install time based on what processor is in the box.

Another thing i would check is that the two CPUs are the same type.

Good luck!

[Scutter]

I found this document that has a brief mention of adding a second processor. This is what it says:

How do I add the second processor to the HP xw6400 and xw8400 Workstations? Is a system board swap required?

CPU upgrades are field and customer installable without system board swaps using the HP xw6400 or HP xw8400 Workstation CPU upgrade kits. The second processor must be the same speed and stepping as the first.

[Future Snake Eater]

What version of Win7 are you running? It looks like only some versions of Win7 will support multiple physical processors.

[Kirkwood]

Enable SMP in the bios.

[Campion]

Reinstalling Windows isn’t going to help if the BIOS doesn’t see the other CPU.

[krogers58]

Just as an aside, you say the second system was not working, do you know what happened to it, and could something have happened to the second processor? As a test, and its risky, but you might be able to get a boot off of the second processor if you install it in the primary slot and remove the original processor. That way you will be able to see if you can get a boot off of it, and you may get more information about it from the bios or others diagnostic software. Just an idea. Of course, if something really bad happened to your second processor, you might actually damage your motherboard by trying the above test. If it was a junker I had laying around, I might try it, but if its your only machine or is needed for a significant reason, I probably wouldn’t try the test above. It all comes down to don’t try it, unless you can afford to lose it.