Strange serial number -- does it matter??

I've just bought a second-hand 20" iMac (early 2006) that has been refurbished by a local Apple dealer -- it seems to run fine but I noticed that the Serial Number as shown in both System Profiler and "About This Mac" is weird: it is "SystemSeumb".
Has anyone else come across this? I've restarted, repaired permissions, etc. -- no change. Should I worry about it, i.e. does it indicate something about to fail? Any idea what might be causing it, or what to do to fix it??
NB: There is a comment in these discussions that serial numbers can be changed during refurbishment, but if so I assume they will still look like normal serial numbers, right?
Running 10.4.4 (not updated to 10.4.8 yet).
Thanks for reading this. Any suggestions much appreciated.
20" iMac 2.0MHz Core Duo   Mac OS X (10.4.4)  

When a system has its logic board replaced, the serial number is generally not programmed into it. If it is refurbished by Apple it will probably have a serial number in that location, but if the dealer has refurbished it, it is less likely.
In this case, refurbish is probably code for "a high value customer bought this, it broke, we gave them a new one to keep them happy, now we've fixed this one and we're trying to make some of our money back"
You can find the serial number for your iMac on the base of the "foot" or on the box it came with.

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