I found a Dutch site that sells them refurbished. It let's you fully configure it, starting from an empty case. Use that site to simulate your exact configuration and you know what they sell if for (in euro's), refurbished, tested and with warranty.
If YOU sell it, 75% of that seems reasonable.
This is the url: www.serverhome.nl/dell-poweredge-2950.html
As I said, it's in Dutch, so you might need to use Google translate to fully understand it.
I was wondering how much my server would be worth.
I am located in Australia.
Dell PowerEdge 2950
CPU: Dual Xeon
RAM: 16 GB Server ECC RAM
GPU: Integrated Graphics
STORAGE: 2x 14K RPM 73 GB HDD, 1 TB Hitachi 7.2k RPM HDD PSU: 2x 750w Hot swappable PSU