Bought a faulty computer from Dell using a 0% loan

unholyangel

OFT state:

The law does not give a time limit for acceptance. When trying to decide if a customer has had a reasonable opportunity to inspect their goods, consider what an impartial person in a court would think reasonable for that product in the circumstances.

Their SoGA explained site used to have an example of a guy buying skiing gear in summer - stating acceptance would likely not have occurred if he later returns the goods in winter as faulty. But I can't find it again.

However I did find this from CAB:

For example, if you buy a lawnmower in the winter and find out when you first use it in the spring that it's faulty, you can probably take it back without being seen to have accepted it.

IMO its quite clear that OP is entitled to a refund.