I assume by Ebay, you mean Pixmania on-line Ebay store. If so then your consumer rights apply, because Pixmania is a business.
You would need to see how the item was advertised, because things like 'known faults or spares and repairs' can make a difference.
Now comes the fun part, Pixmania have had quite a bashing when they first started up in the UK, due to poor customer services. But this stabalised a little, because Pixmania had a returns arrangement with Currys (Both being owned by the same parent company). Not sure about that now though!.
Is there not a manufacturer's warranty, which you could try for advice and help?.
You could try Ebay or PayPal by registering a dispute, or contact your credit card company for further advice, should Pixmania fail to communicate with you.
You also have Consumer Direct click here to offer advice. Pixmania use to be registered in France, but EU/UK consumer law should cover you.