I recently bought a new computer and put it together myself. Everything worked great the first day then on the second day my computer froze and when I went to restart it my Graphics card began to smoke and sparked. I pulled out the card and noticed a chip at the bottom left of my graphics card had been damaged.
Yes it maybe the PSU, because unknown brand which we don't trust may rate 1000W as their maximum wattage, but actually it may have been only below 500W. You'd better replace the PSU before this happens again!