All RAM not being recognized on Linux RHEL after adding RAM
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Somewhere on the web, it says that after reboot and after the GRUB boot screen has loaded, type e for edit and then choose the kernel line and add the mem=xxM or mem=4096M in this case. Eventually, it would boot.
I didn't perform this last step and am wondering if that is where it failed.
If you put the mem= in the actual grub.conf file, then you don't need to worry about editing the line as you are booting. You only need to do that if you want to temporarily boot with different parameters. Say you wanted to boot to the commandline once, and not into X, you would add " 3" to the end of the kernel line, hit enter to quit editing, then hit b to boot.
As for the memory problem, did you check to make sure the motherboard can handle four gigs of RAM? If it can, I would pull out the old RAM and just boot with the new, to make sure it's good.
The motherboard support 32 G. It was intended to have Windows Server on it, but I installed RHEL. The vendor won't help because they only support Windows.
Anyway, I had thought about taking out the old ram and seeing what happens.
As I was reading on the web, I also found this:
Find out if the displayed quantity is the same as the known amount of RAM in your system. If they are not equal, add the following line to the /boot/grub/grub.conf or /etc/lilo.conf file, depending on the boot loader you installed:
How much ram does your system BIOS see? If the BIOS only sees the 2.59GB then you have a hardware issue and not an os issue. If BIOS shows 4GB RHEL only sees 2.59GB, then it would be a matter of figuring out whats wrong with your os config.