Ninja 2 doesn't work on Phenom X3 720

[ashrack]

Got it to work now. Today I have tried to mount it again and the machine booted up fine. Really don't know what was the problem when I first tried to mount it about 2 days ago.

Below is the original post:
Just bought a Phenom X3 720 to replace Athlon 5000+, and if I mount the NINJA2 on it, the CPU will not start. But if I only place the NINJA2 on the CPU without any pressure being applied then the CPU works.
So then I mounted the box Phenom cooler and with that it works without problems.

What is the problem?

ps. Before I had Athlon 5000+ and the Ninja2 worked on it without problem.

[kwak]

I faced a similar problem with an Intel E8500 over an MSI p45 Neo and a Ninja 2 SCNJ 2000. I came to that conclusion:
If I tighten to much the backplate, the motherboard is bending, including the memory slots. The memory connection is not perfect anymore and this is creating errors on motherboard which will crash on startup (much before reaching the Bios screen).

For Scythe people:
No matter how tighten (or untighten) will be the screws, the motherboard will inevitably bend a bit due to the backplate conception and more especially repartition of foam on a very rigid piece of metal faced to a relatively soft PCB. To say it simple you have a big surface of foam on center of the backplate and a relatively small surface on the extremities, and thus despites the pressure points (screws) are there also.
This mean that the foam will be much more compressed on the extremities making the PCB to turn convex.

There are few things that can be done against this problem:
_ Leaving an hole (or a bigger one ) in center of the backplate.
_ Making the backplate concave to compensate this effect
_ Not putting the fixing screws at the extremities of the backplate but a bit more on the center (or making the backplate "legs" continuing a bit after the crews)

I would also strongly advice to put a marker showing when the screws are tightened enough: some models are using springs on each screws as dynamometers.

[ashrack]

KWAK
I do not use the backplate. And even if I just put the NINJA2 onto the CPU without mounting it and applying a bit of pressure with my hand the CPU will still not work. Whereas with stock AMD cooler no problem

[ashrack]

there has been some debate over at MSI they suggested contacting SCYTHE because apparently NINJA's are applying to much pressure:
Cooler Scythe Ninja 2 doesn't work on Phenom X3 720