This is a problem with kits and whether the suppliers have provided suitable parts that are compatible with each other. If the supplier as stated certain components are suitable and have supplied them as a complete kit, then you would have a claim under 'fit for the purpose'.If the supplier sold individual parts to your requirements then this would be your responsibility to check components compatibility before purchase.
There are two Eclipse Computers, and one is based near Coventry. If Eclipse-Coventry is the one, then I have used them in the past and found their service either very good or on occasions very wanting.
You can contact Consumerdirect click here for further advice.