Unlikely it is a bad CPU, because it boots, but it is possible since you had bent pins, you may have short circuited the CPU and damaged it.
However, by far the most likly is that one (or more) 4 heatsink bottom clip mounts is not all the way down into the hole before the locking knob was pressed into place.
The HS anchor has 2 parts. With the push knobs pulled up, the lower plastic piece need to be pushed down into the hole.Then the push knob pressed down.
If the knob get pressed down before it goes in the hole, it will hold that corner of the heatsink off the processor and over heat in about 2 minutes.