New cpu, computer shuts off after 2 seconds

[Guest]

Hello,

got a new cpu upgrade, replacing my old pentium d 805 with a core 2 duo e7500.

when I insert the new cpu the computer simply turns itself off 2-3 seconds after pressing power button. before it shuts off it seems to be working fun, fan turning etc.

If I put my old cpu back in it boots fine, the heatsink is fine, thermal paste etc all check + old cpu still boots so...

what could be the problem? can it be my MB doesn't support core2duo? pentium d and core2duo is same socket so I doubt that.

please help.

 

[jsc]

Having the same socket in common is no guarantee that the motherboard will support a particular CPU.

 

[Guest]

how can I check that the MB supports it?

 

[Guest]

seems you were right, I just assumed that same socket = support.

a) Lesson learned

b) the weird thing is my mobo supports all the core2duo's up to e6850, but not above it, like my e7500. what is that?

 

[someguy7]

65nm 6850. 45nm e7500. Is the main change. There are others as well.