. . . At first, my sound wouldn't work when connected to the computer. Then the computer would have issues restarting.
. . .
PSU: blackstone rx-700ac (700w - set at 115 in the back)
Can't be certain exactly what issues you had before - pretty vague description - but you're going to want to buy/borrow a quality psu, swap it in, and see if that solves the problem.