RAM missing

[cschmelz]

So I have had my 27" i7 (July 2010) for about a month. On initial install the RAM showed 12gb (which is correct). I had the stock 4 GB and then added 2 4GB chips from OWC. They displayed correctly.

Now, suddenly am showing 6GB. Bank 0 DIMM 0 empty, Bank 1/DIMM 1 2gb, Bank 0 Dimm 1 Empty, Bank 1 Dimm 1 4gb.

WTF?!?

Reseat all and try again? Seems an odd failure. Bank 0 give up the ghost? Just seems really odd both factory and add in ram suddenly failed...

 

[87vert]

try reseating the modules and reset the PRAM.

 

[cschmelz]

try reseating the modules and reset the PRAM.

Tried both... Fail!

Still only showing the 6gb....Arghhhh

 

[MacHamster68]

could be a simple as some of your ram is gone bad , try swapping them between slots , but make notes where every module was and then you will find out if ts the ram itself or the ram slots ,if you find its the ram return it to owc if the slots are dodgy return it to apple as faulty

 

[cschmelz]

could be a simple as some of your ram is gone bad , try swapping them between slots , but make notes where every module was and then you will find out if ts the ram itself or the ram slots ,if you find its the ram return it to owc if the slots are dodgy return it to apple as faulty

Interestingly swapped out Apple RAM and put in only OWC RAM and machine repeatedly kernal panic'ed. Removing OWC RAM and putting in Apple RAM results in stable machine.

Weird that problem was active yet it passed both extended hardware tests AND Memtest 4.22 runs but OWC add in RAM appears to be faulty.