Bought a refurb HP desktop through Bestbuy, had no...

Bought a refurb HP desktop through Bestbuy, had nothing but problems with it and microcad wasn't very responsive. Graphics card died within a month, I stayed on them, and they sent out a replacement that was inferior, and now it's giving me problems. Computer runs loud. Something's not right with it (to go through 2 graphics cards) and when I finally get a response it's send it back for inspection. I use my PC to earn a living, can't be without it for like 2+ weeks. I even offered to buy a different PC, pay in full for it, and then ship this one back in that box for them to review and refund whatever they find suitable. No response. Now I paid good money only to be stuck with a POS.