Computer Won't Recognize Three of Six Slots of RAM

I'm sorry if this original question as posed doesn't provide enough information. Let me know what is needed and I'll provide promptly.

Anyhow, I noticed my computer is not recognizing all my RAM. It used to show all of the RAM I have when I clicked Control Panel --> System, but now only shows 9 GB (I have 15 I believe). 3 of the 6 slots are being recognized. I have Windows Vista 64-bit and I don't understand why it would have recognized all before and now only half.

Any ideas?

 

My computer & specifications

Only difference is the extra RAM I added and also have a bigger power supply.

 

Oooookay. Here we go:

If you look in System Information, how much does it read there?

How much does it report in your BIOS?

Does the amount change if you take out three modules?

If it does, how much do those three show up as if you put them in and remove the other three?

If the modules are not showing up correctly you need to start narrowing things down. Test them one by one in slot 1, with the other slots empty, and verify the amount in BIOS or Control Pane (preferably both).

Report back with lots of numbers, and we'll go from there.

 

I will be messing with the slots of RAM in a bit.

So far, I can tell you that both System Information and BIOS report 9 GB of RAM. Should be 12, IIRC (3 1GB sticks that came with the CPU and 3 3GB sticks that I bought seperately).

I'll report my later findings ASAP. Thank you so much for the response, I didn't feel comfortable dealing with all of this without some guidance before I delve into it.

 

I'm not aware of any company that makes 3GB modules. The available sizes are 1GB, 2GB, 4GB and in some cases 8GB. Double-check that it's not 2GB modules. If it is, you have 3x2GB and 3x 1GB, which adds up to 9GB, and that in turn means it's showing correctly.

 

Then I think it was 3 4GB modules along with the 3 1GB. I remember for sure I had more than 10 GB.

I'll use that program in a bit and post the log. Thanks again.

 

Just to note, whatever my RAM configuration was, the computer did recognize it at one point. I think the specification link I posted above mentioned that the RAM for this system is expandable to 16 GB.

I've also attached the Everest Log generated according to the above directions.

 

Speccy Report attached.

 

What exactly does that report tell you? Does it suggest anything is wrong?

 

lol, well looks like maybe I'm just an idiot and forgot how much RAM I had in my computer. Given what it's saying and seeing in the log what each port is reporting, I'd think that has to be right. Especially with the serial number verification you performed, Halo.

There isn't any performance issues or anything with my computer that made me think this, I just thought I had more than 10 GB for some reason, but I guess not.

Sorry if I wasted your time, but on the other hand, this really helped me out and gave me peace of mind rather than thinking something is wrong with my computer. Thank you all for your assistance! This was my first time posting here and it's great to know there is a website like this one can come and get expert analysis on what issues we encounter. Very much appreciated.

 

If you ever need more than 10GB, you can get up to 12GB in that system. The motherboard limits you from going higher than that unfortunately.

Glad you got things figured out. No matter what else, it always helps to know what you're dealing with.