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New cpu, computer shuts off after 2 seconds

Last response: in CPUs
a b à CPUs
February 26, 2010 10:50:01 AM


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.
a c 172 à CPUs
February 26, 2010 10:59:45 AM

Having the same socket in common is no guarantee that the motherboard will support a particular CPU.
a b à CPUs
February 26, 2010 11:22:40 AM

how can I check that the MB supports it?
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a b à CPUs
February 26, 2010 11:36:18 AM

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?
a b à CPUs
February 26, 2010 2:22:57 PM

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