Mobo only see a single RAM module

[bwallx]

Mobo: Maximus VII Ranger with i7

I have two RAM sticks: 8.00GB Single-Channel DDR3 @ 799MHz (9-9-9-24)

The mobo will work with EITHER one fine, but not two, regardless of the slots I use. It displays 55 RAM not found on the LED and cycles trying to configure forever.

I also have an old set of 4x 4Gb sticks that result in an FE error on the LED on the mobo.

Any ideas as to what is wrong please? The UEFI has an excellent range of options for RAM but clearly can’t open it with two sticks installed.

Is there settings I can set when booting with just one stick that will make it work with two maybe?

[phillpower2]

Is this a new problem that has just happened and things been working perfectly fine before.

[bwallx]

Difficult to say and I’m currently rebuilding the pc and swapping mobos and drives and generally messing about. They are a proper module ram pair and did work together last year on a different mobo to one I have now.

[phillpower2]

From where did the MB come from and and do you know with 100% certainty that it was and still is in full working order, you have confirmed that the RAM is good but for all we know the MB concerned may well have been tossed in the trash by someone else down to this very problem.

[bwallx]

LOL! No it is not a dumper find! It is a Maximus Ranger I had replaced with an Asus Z87 but the Asus died so swapped back to the Maximus. I forgot why I bought the ASUS. Is there anything in the UEFI I can set now before trying the two rams together again please?

[phillpower2]

Sorry but that does not answer the question I`m afraid, the Ranger is a Z97 chipset and swapping to the ASUS Z87 would therefore be a downgrade and you would not normally do that for no reason.

As far as you are aware was the Ranger MB in 100% working order and stored somewhere safe.

Regarding the BIOS, to my knowledge there are no MBs that allow for enabling/disabling individual DIMM slots.

DIMM slot A2 is the slot that should be used when there is only one stick of RAM, have you tried one stick of RAM at a time in slot A1, B1 then B2, if you can get the computer to boot doing each of these tests it goes some way to suggesting that the memory slots are ok and the problem elsewhere.

[bwallx]

I swapped as I was getting issues with windows not booting, recovery mode not working and so on so tried my old mobo. Lets ignore that.

The Ranger was working fine and stored in the plastic anti static bag.

Re the bios, I was wondering in the Ranger’s extensive over clocking setting could be used in some way. At present the bios is set to run the cpu in non-turbo mode with no o/c. Or is CSM or something might have an effect on RAM compatability etc. I know enough to screw things up - a little knowledge etc..

I tried the stick/s in various slots and combinations but know that A1 & B2 are the primary ones for two sticks.

Thank you for your help. I also have 4x 4Gb sticks and the mobo doesn’t like them! So maybe a mobo hardware fault? I’d buy a new one if needed. Any recommendations for the hasswell i7

[phillpower2]

I swapped as I was getting issues with windows not booting, recovery mode not working and so on so tried my old mobo. Lets ignore that.

You may wish to ignore it but not those trying to help you, we need to get as much info as we can to make sure that nothing gets overlooked.

UEFI BIOS is more to do with security than anything else and all the other things that a MB has are called features or tools, what can happen in the BIOS though is a bad setting may be set, RAM manually set to run at too high a speed than the RAM is capable of being one such an example and a CPU being OCd too much being another.

Have a suggestion but can you clarify something for us first, I asked the below;

have you tried one stick of RAM at a time in slot A1, B1 then B2, if you can get the computer to boot doing each of these tests it goes some way to suggesting that the memory slots are ok and the problem elsewhere.

You answered;

I tried the stick/s in various slots and combinations

Did the PC post when you tried the both sticks, one at a time in any of the other three slots, this is important for us to know, if the PC would not post when trying one stick at a time in any of the other three slots it goes some way to confirming that it is a MB as opposed to a RAM issue.

You are welcome btw

[phillpower2]

Thread closed due to lack of feedback from the OP.