RAM wont work?

What motherboard do you have?

Asus p7p55d-e lx here is a link to it http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I'd suggest a Google search-it seems there are lots of possible solutions, some of which you have already tried, and some of which seem really strange, like re-seating your CPU fan, but several people swear it worked for them. Another possibility is incorrect RAM timings in BIOS, and RAM reserved for hardware, which you can check from the Resource Monitor.

thanks for the fast reply

If you've been in your bios recently you may have mucked around with the PCI address mapping. This is used to make addressable memory on peripheral devices accessible to the OS. On legacy systems (IE, OSes not running in long mode, AKA 64 bit mode) this was still confined to the 32 bit address space and was taken out of the 4GB of addressable memory which resulted in the infamous 3.25GB of usable memory on a 4GB system problem. This same problem occurs on 64 bit systems when the bios is not properly configured to map the addresses to a higher range and the result is that 8GB can look like 7.2, 12 can look like 8, etc... it all depends on the particular system. Take a look around for this

thank you very much

I suggest to remove the RAM sticks and place them back again.

Reseating the RAM helps a lot.

What is the RAM capacity listed in bios?

[edit] More importantly, what is your ram configuration? I ask because the board you list has 4 slots, but the only way to get 12gb on 4 slots is by using 3 4gb sticks. That could be your problem.

2 x 4GB + 2 x 2GB = 12GB

That would be my guess for his configuration.

i have 2x4gb and 2x 2gb. i took out all the ram set it back in, that did nothing =[ I also tried again and put them in the opposite slots that did nothing. here is the ram that i have:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

my motherboard should and has supported them.

Well, looking at those specs, one of them calls for 1.65V and one calls for 1.5V, and it's the 2 x 2GB sticks that call for 1.65V. You shouldn't have an issue if you bump up the voltage enough to make the 2 x 2GB sticks happy-check in BIOS and see what voltage it's running at now, and if it is lower than 1.65V, bump it up and see if that solves it.

Probably your BIOS update killed your overclock, if you had one before. Or maybe the old version of the BIOS was better able to deal with 2 different voltage requirements.

Yep, ^ that is where I was heading too.

Mobos can handle all kind of RAM's, but different voltage between other sticks can do just this!

thanks guys, ive gone everywhere and no one has been this helpful!

i adjusted the voltage higher and still nothing. I might be doing it wrong, but i go into the bios setup and is it DRAM voltage?

Yeah. Are all 12GB detected in BIOS?

Make sure all is unchecked in the max memory.

In the msconfig.

its uncheck in the msconfig, how do i check if my bios see's all 12 GBs?

i got it to show the ram and it said only 8191MB so it is only seeing 8GB. How can i update the BIOS to fix this since the MOBO supports different voltages and up to 16GB? I do not have the original MOBO disk

Apparently the "BIOS" update i did didn't do anything so I am going to assume i did it incorrectly.

Have you tried to see if the CL timings are the same on both sets? I know you have a difference in voltage, try seeing if you can get the CL timings to match.

OK, can u remove the 8GB and run just that 4GB?

Actually, what I would do is see if removing the 2 x 4GB sticks lets the 2 x 2GB be recognized by BIOS. Right now you don't know if the problem is with the RAM itself or if it's the combination of the two RAMs that's causing the problem. So start with the basics-does the 2x2GB setup work by itself?

yes, they both work if i do them individually

Insert all in and reset.

Reset the CMOS memory the right way as is described in the motherboard manual using the clear CMOS link with the power cord unplugged.
How To Clear CMOS @ http://pcsupport.about.com/od/fixtheproblem/tp/clearcmo...

have you checked to see if its useing that ram to your video card in your bios. I had this same problem and that was it

If you have the 4GB working properly, what happens when you add the 8GB? And what voltage is the DRAM running at when all of it is in there together?