For sale my Mac mini running El Capitan OSX - awesome little computer and going better than ever with the recent upgrades.  No faults whatsoever - DVD drive working well.  Also in great cosmetic condition, and no yellowing on the plastic top of the unit (common problem with poly Mac Minis).  Still crisp white!  Aluminium appears to have no marks at all.

This one comes with a genuine Apple wireless keyboard (2 battery model), and a genuine wireless Apple Magic Mouse with all the additional gestures - not crappy Chinese copies which just spoil the Mac experience. 

RAM upgraded to 4Gb.  You could take it to 8Gb as an additional (unofficial) upgrade, but I don't see any point as it flies along with 4Gb.

Hard disk has been upgraded to a Kingston SSD (120Gb), and will be wiped clean and a clean install of El Capitan OSX put on there before despatch, ready for the new owner.  120Gb is more than enough for most users, and you can of course attach an external drive if you have heavy storage requirements e.g. dozens of films or TV episodes.  Doing it this way keeps the internal disk clean, and the machine super quick.  

With the SSD upgrade, I doubt it was ever this quick when it was brand new.  Boots from apple logo to desktop in 17 seconds, and programmes open so quickly.

MDP to DVI adapter included (you can get a DVI to HDMI or DSUB for a couple of quid on eBay if you need to).

Apple remote control - ideal if you're using it as a media centre, or if keyboards are just a bit too much hard work!

Creative webcam/microphone included so you can FaceTime like the iMacs and the MacBooks!

Just add your own monitor and you're good to go!

Installation DVDs included for the old OSX Leopard and Snow Leopard as well as a bootable USB thumb drive with an installation of El Capitan OS.  You can do a fresh install of El Capitan any time you wish with the thumb drive (on this or any other Mac that will run it).  Just Press and hold the Option (⌥) key immediately upon hearing the startup chime to boot into the installer. 

Comes in original packaging with all booklets etc.  Will be sent signed for delivery.

There are plenty of Mac mini's on eBay, and many cheaper than this one, but this has the upgrades and accessories to make it a pleasure to use.

Any questions please ask, but price isn't really negotiable, as it owes me some money this one.  Even with second hand Apple, you get what you pay for.