Whats up with my CPU?

[Platinum]

Took apart my system to fit a Akasa EVO 120 to my FX57, got it all fitted and powered it on and went into the bios only to see the temps rise to 90 degrees , I took the system to bits and removed the heatsink and it looked to be making contact fine, so I then refitted the old swiftech cooler and its still hitting the high temps, i felt the base of the heatsink and it was warm but not hot, the bios then proceeded to lock up , whats going on? is the CPU shafted?

[herulach]

Did you clean off all the existing paste and put some new on (arctic silver 5 recommended)

[nvening]

It sounds like someone forgot to paste it up lol, with an fx57, youch

[Platinum]

#Im Im not that much of a n00b , seems that it wasnt fitted right, prolly due to these heatsinks being a right bitch to install with the ****e plastic back plate that came with this mobo.
Think ill be leaving this system as is for now as seeing a £700 CPU hit 90 degrees is a scary sight lol

[herulach]

They are a bit annoying arent they? try installing a waterblock with the houses attached while holding the motherboard off the floor with one hand, the block with the other and trying to screw it in with the third

[Platinum]

Got the system up and running and the idle temp widly jumps between 54 degrees and 62, fire up prime 95 it jumps to 80 degrees and prime fails

[Platinum]

Just been using the machine and its bluescreened and rebooted :/ so thats staying powered off untill I can think of a solution.
I dunno whats up with it, reseating the heatsink got the idle temps down to 60 odd but at load it shoots up.
gonna see if I can locate a stock cooler for it or something that fits using the original hold down bar, at least that way I can garentee good contact and rule that out.
Its pretty strange though as every time I have removed the heatsink it appears to have made good contact.

[herulach]

Yeah, thats still not seated right. Sure youhavent put too much goop on? What motherboard is it? Some of them have god awful temp sensors

[Platinum]

nope thin layer, like I say when I examened the CPU and heatsink after it looked fine.
Motherboard is irrelevent as it was working erlier