CPU not working on a certain Mobo

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FoXtroT

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Does anyone have any idea why a CPU would not work on a Mobo, when you can get the mobo & CPU to work perfectly; just not together?

The CPU is an i5-2400 and mobo Gigabyte B75M-D3H.

Its driving me nuts. The CPU I have in my main system works fine in this mobo (i5 3750K) and the i5-2400 works perfectly in my main system's mobo (Z77 board), just not together.

The CPU is on the motherboard's supported hardware, and googling the issue doesn't seem to bring anything up. Mobo doesn't have any bent pins either so its not that.

If I put those two together, the system starts but does not POST. I'm just completely lost, anyone have any ideas?
 
You might need to update the BOIS on the board, have you tried that?
 
I can't think of anything obvious, weird one.

Have you maybe tried using different ram sticks with the 2400?
 
Tried different RAM but they are the same model of corsair ram. I will by some cheap Kingston ram and see if that helps.
 
I would not go and buy ram, rather borrow from a friend or something. It's probably not ram related at all.
 
ponder said:
I would not go and buy ram, rather borrow from a friend or something. It's probably not ram related at all.
Click to expand...

I'm gonna need the ram anyway. Not enough spare lying around for this system.
 
ponder said:
I would not go and buy ram, rather borrow from a friend or something. It's probably not ram related at all.
Click to expand...
Not suggesting to buy RAM either, but it could be RAM related matter. 3rd gen CPU might access the RAM differently. Poor voltage powering RAM or some copper track on the motherboard can be damaged causing only newer CPU working properly.

I would try to check whether it beeps without RAM, then wether it works on a single RAM module, then trying a new RAM.
 
Last edited:
sajunky said:
Not suggesting to buy RAM either, but it could be RAM related matter. 3rd gen CPU might access the RAM differently. Poor voltage powering RAM or some copper track on the motherboard can be damaged causing only newer CPU working properly.

I would try to check whether it beeps without RAM, then wether it works on a single RAM module, then trying a new RAM.
Click to expand...

It does give me a beep code if it doesn't have a RAM module in it. So more than likely it is the RAM.
 
FoXtroT said:
It does give me a beep code if it doesn't have a RAM module in it. So more than likely it is the RAM.
Click to expand...
On the other thought, perhaps you should reset BIOS to defaults before changing CPU. You can also do it with new CPU assuming you can get to the setup. Or you can do it by a jumper.

If you have tried Gigabyte performance tuning utilities, such setting is only valid for the current CPU, it is why reset to defaults is required before changing CPU.
 
sajunky said:
On the other thought, perhaps you should reset BIOS to defaults before changing CPU. You can also do it with new CPU assuming you can get to the setup. Or you can do it by a jumper.

If you have tried Gigabyte performance tuning utilities, such setting is only valid for the current CPU, it is why reset to defaults is required before changing CPU.
Click to expand...

Don't worry, clearing CMOS and resetting the BIOS was one of the first things I tried, to no avail.
 
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