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Machine turns off after installing CPU

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  • CPUs
  • Heatsinks
  • Motherboards
Last response: in CPUs
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December 30, 2009 7:13:09 AM

Hi guys,

I just received a new CPU that I was hoping to upgrade my current machine with. I am going from a E6400 to a Q9400. However, after installing the Q9400, the machine starts up for maybe half a second, then shuts down. I thought maybe I had the heatsink on wrong, but I checked that it looks to be okay. I took the CPU out and turned it on to see if the machine would at least turn on, and it did. I then put the E6400 back into the machine and tried turning it on, but I got the same result as with the Q9400. Did I potentially do something to my motherboard during the upgrade process? Any insights are welcome!

Thanks in advance guys.

Stone9

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December 30, 2009 7:16:22 AM

Try doing a reset from the motherboard. also check your connections. I hope did not touch the backside of the CPU when installing. If you touch the pins they do get damaged sometimes.
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December 30, 2009 7:33:43 AM

Your mobo may require a BIOS update to support the 45 nm core 2 chips, or it might not support them altogether.
Check your manufacturer's webpage to see if the cpu is supported and if so which BIOS version is required.
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December 30, 2009 10:57:35 AM

Check your mobo's site to see whether it support quad processor or not...
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December 30, 2009 5:11:49 PM

Would it be a quad core support issue if the older E6400 doesn't work either anymore?
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December 30, 2009 5:17:04 PM

Also, would putting in a CPU that isn't supported either by design or because of inadequate BIOS do damage to the mobo?
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December 30, 2009 5:32:11 PM

Using your old CPU to check :-

firstly download CPUz and run the programme to identify the make & model of your motherboard. Then head to the manufacturers website and check the CPU compatibility list to see if your mobo supports the Q9400 - it may require you update your BIOS


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December 30, 2009 5:32:49 PM

hell_storm2004 said:
Try doing a reset from the motherboard. also check your connections. I hope did not touch the backside of the CPU when installing. If you touch the pins they do get damaged sometimes.



Scoket 775 CPU's do not have pins on them - the socket has the pins :) 
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December 30, 2009 7:31:00 PM

How can I tell if the socket pins have been damaged?
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December 31, 2009 5:22:36 AM

You don't need to worry about that; as ulysses35 said, the socket 775 chips don't have pins (instead they have metal contacts) so its very hard to damage the chip.

As for causing damage, you shouldn't be able to cause any major damage to your mobo, but its a possibility you could fry the new cpu. In short, use your original cpu for now, and check the mobo's cpu compatibility as I suggested in my first post.
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December 31, 2009 8:41:22 AM

Well, I purchased a new mobo and now both CPU's worked. I couldn't find anything wrong with my socket, no bent pins or anything. Not sure what the problem was. Wish I didn't have to buy a new one, but I'm glad the CPU's weren't damaged, cause that would have been more expensive.
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December 31, 2009 5:59:05 PM

Your old mobo most likely didn't support the quad. Glad to hear that you have it running now, though.
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