Am I entitled to full refund if I purchased a computer as new when in fact it was refurbished?

Question Details:

Bought a computer on-line from a major seller. Computer described as new but it developed fault; I was told by service technician that was factory refurbished model. I was also informed that warranty was only 90 days and it had run out 3 months prior. Computer could be repaired for $320. I said no and charged $80 to get computer out, even though it was not fixed. Seller has offered to fix if sent back in original box and packaging and that I pay for postage both ways. I am annoyed to being misled and feel I should get refund or new machine. What are my rights?

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