moving HD with 32bit Feisty from 64 bit motherboard to 32 bit motherboard

[Krsnendu dasa]

I have a problem with my server. It randomly disconnects every half hour or so.
I suspect it is a hardware problem. Probably mother board, although
someone suggested it could be the powersupply.

I am using 32bit Feisty Edubuntu with smbldap on an Intel quad core.

I tried using a different switch. No change.
I tried disabling the onboard LAN and using a PCI network card. No change.

Now I want to try two things simultaneously:
1. Reinstall Edubuntu on the 64bit server using 32bit Gutsy
2. Take one hard drive from the raid one and trying it on another
machine which is AMD 2500XP 32 bit machine.

Is this possible or will the system not handle changing from quad core
64bit system to 32bit single core?

I want to do both simaltaneously so that
a. current users can keep working as before, while I set up the upgraded server.
b. I can confirm that it is the hardware on the current machine that
is causing the problem

If I can get the 32bit machine running, I predict that it will run ok
and that the newly installed Gutsy will show the same problems as the
Feisty install. This would confirm that it is a hardware issue.

To repeat the key question:
Is it possible to transplant the system HD or will the system not
handle changing from quad core 64bit system to 32bit single core?

Any other suggestions welcome.
Thanks.