Tarmac is right, save up. Use credit for buying a home, not a PC.
Try this: add the total number of payments together and compare that with what you pay if you used cash. Most people would never pay 20 to 40 percent more for something if they didn't have to.
If your trying to establish credit you should save up the entire amount needed for purchase, use half to make your purchase and finance the rest. After 6 months take the remaining money you had saved and pay the balance.
I hope this helps.