boot up problem

Well, it is very possible that the CPU was damaged.

The first question is were either of you properly grounded when the CPU was handled?
Not just touching the chassis, but wearing a grounded wrist strap!
If not, directly touching a pin is VERY likely to damage the CPU from static electricity.

It can take as little as 50 volts to damage a CPU. It takes around 4000 volts to produce a shock that you can feel.

Next, depending on the location of the pin, and how far it was bent over, it is possible that the wire bond was broken, or the IC Die got cracked.

If a cooling fan was installed with the CPU setting up in the socket from the bent pin, I all but guarantee that the die is cracked.

It takes very high magnification to see most die cracks. 200X plus.

I know that some of the computer show dealers border on fly-by-night outfits.
However, if this is a reputable dealer, they should be willing to exchange the CPU.

Chas