Assuming you would be looking to replace the PC at some point, selling it would be a very expensive way to raise finance. It would basically end up costing you £300 to raise £400 of finance.
Credit card debt is expensive, but nothing like that expensive. Even if you are paying say 25% on credit card debt, thats 'only' £100/year (25% of £400 each year). So unless you are going to leave the credit card debt outstanding for 3 years, it's a rather more cost effective method than selling your PC. You mentioned paying it off within 4-5 months, which would make it vastly cheaper than selling your PC.
However, make sure you absolutely stay clear of those pay-day loan companies. The interest rates they charge are outrageous (like thousands of percent). They should be outlawed in my opinion.
Credit card debt is expensive, but nothing like that expensive. Even if you are paying say 25% on credit card debt, thats 'only' £100/year (25% of £400 each year). So unless you are going to leave the credit card debt outstanding for 3 years, it's a rather more cost effective method than selling your PC. You mentioned paying it off within 4-5 months, which would make it vastly cheaper than selling your PC.
However, make sure you absolutely stay clear of those pay-day loan companies. The interest rates they charge are outrageous (like thousands of percent). They should be outlawed in my opinion.