Power/Boot issue with new i7 CPU

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devinj2306

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Sep 18, 2013
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I'm currently running my computer on an Intel Core i5 2300 and I recently purchased an i7 3770 as an upgrade. After installing the new Core i7, when I try to power my PC on, the power comes on for a second or two then turns off, then powers on again for one or two seconds then turns back off again and repeats until I switch off my psu.

If I put my i5 back into the PC, then the computer starts up normally and runs just fine. It's only when I put my i7 in, that it wont start up/stay on for more than a couple seconds.

I tried updating my bios and clearing my CMOS but I still get the same result.

Is my new cpu DOA, or could it be that my power supply has enough power to run the i5 but not the i7?

Here are my other specs

MSI Ph61a-p35(b3) mobo
Rocketfish 750w psu
2x4 GB DDR3 RAM
Nvidia GTX 560
500gb Seagate HDD


Any help would be greatly appreciated.


 
Solution
PCDave


I think Eximo is right, both chips pretty much have the same power consumption, I think its an CPU issue.

Have you bent any pins on the CPU? Make sure your CPU is detected by the BIOS, etc.

Your CPU is supported, as listed here: http://ca.msi.com/product/mb/PH61A-P35--B3-.html#/?div=CPUSupport

and since your ivy bridge CPU is fine, I really think its the CPU.

To contact Intel Support, find them there...
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PCDave

PCDave

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May 22, 2013
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I think Eximo is right, both chips pretty much have the same power consumption, I think its an CPU issue.

Have you bent any pins on the CPU? Make sure your CPU is detected by the BIOS, etc.

Your CPU is supported, as listed here: http://ca.msi.com/product/mb/PH61A-P35--B3-.html#/?div=CPUSupport

and since your ivy bridge CPU is fine, I really think its the CPU.

To contact Intel Support, find them there: http://www.intel.com/p/en_US/support/contactsupport?group=desktop
or directly send them an email at click.support@Intel.com
more details here; http://click.intel.com/customer-service

 
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devinj2306

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Sep 18, 2013
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Thanks for the reply. I'm not sure what you mean by un-supported stepping, though.

 
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Eximo

Eximo

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Just interesting information at this point since MSI makes no mention of any issues, but:

Intel will make changes to the physical construction of the chips to make improvements, correct defects, or increase yields. Usually there will be a few steppings per model of chip, and they are usually quite interchangeable. Every once in a while there will be a flaw that makes some boards incompatible with certain revisions of chips.

It is that long string of numbers you see on the Box and printed on the CPU that has the details, sometimes they print it in human readable form.

CM8063701211600 / BX80637I73770 / BXC80637I73770

B0, B1, B2 are pretty common values. That last one has C stepping.

Occasionally this becomes important to enthusiasts for overclocking and the like. If I recall correctly the C0 steppings of the bloomfield series could clock much higher then the B1 steppings.
 
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devinj2306

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So, I went ahead and got an RMA from Newegg and they sent me a replacement which arrived last night. The new chip did the exact same thing. The power wont stay on long enough to boot. Any other ideas of what the problem could be?
 
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Gaidax

Gaidax

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Update your motherboard BIOS.

I had a similar issue with Core2Duo and MSI motherboard - I had Core2Duo E6600 and I upgraded to Core2Duo E7500 on the same MSI motherboard - their site said it was compatible, but in reality they added that compatibility with BIOS update, so I had exact same thing - PC not booting despite there being power and it seemingly "starting" to boot.


Explanation: I5-2300 is a Sandy Bridge architecture from 2011, so you got motherboard with BIOS version that supported Sandy Bridge CPUs. I7-3770 is a newer Ivy Bridge architecture that came year later, so your motherboard simply does not have the "information" on this thing, thus you need to update BIOS to support it.

Go poke MSI on how to do it.


This thing happens often, the motherboard is physically capable of supporting a newer CPU with the same socket and chipset, but it's BIOS is old and it's not "aware" of the new CPUs out there. So it can't work with it without update.
 
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devinj2306

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Sep 18, 2013
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Thanks for the quick response. I did update my bios before I installed the new cpu the first time. Could it have updated to the incorrect version perhaps? I used an automatic bios update tool from MSI rather than doing it with a thumb drive. Would that make a difference?

Either way, I'll take a look on MSI's site and see if I missed anything,


UPDATE: Okay so you were 100% correct. The auto updater I used updated my bios, but not to the latest version. I found out which version I actually needed and after I updated, my new i7 is up and running. Thank you so much for your help, you made my day :).
 
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PCDave

PCDave

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Crap, forgot to mention updating the BIOS :(

Yeah, the BIOS is really important, I thought you updated your BIOS with the latest version, guess MSi fail.
 
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