Strange RAM Issues

[OSXMan]

I have a strange issue, I recently got my old server back and it hasn't ran in about 4 years and I now have an issue with it....

Issue:
I have a 512 ram stick in it now, along with a 1gb, yet when the PC boot it only registers the 512 stick, if I throw in another 512 stick it simply doesn't post.

I know both ram slots are good as the 512 stick registers in both. I am sure its a problem with the 1gb stick seeing, but you would thing the motherboard would give some kind of indication of post beeps if a bad stick was in there.

Let me know what you know.

Quick footnote: this is on a AsRock P4i65G Motherboard.

 

[Zap]

Have you tried the 1GB stick by itself?

Is this an AMD CPU? I've had AMD CPUs where the memory controller starts going bad, and will start to only register a single channel of memory.

 

[OSXMan]

Yes I have, it won't post with just the 1gb stick in....and no it's a s478 2.8ghz p4