Windows won't recognize more than about 3.25 to 3.5 gB of RAM (this is due to how it allocates address space) on a 32 bit system. 64 bit systems will recognize the entire amount.
I don't know if this will affect you, but several high end HP's that I've worked on have had BIOS issues with the hard drive recognition order. Be advised that these were all IDE systems without RAID. The fix was to disable all IDE channels that did not have anything on them (set it to None in the BIOS), then to move the boot drive over to be the Primary Master. I'd try something similar with your HP, but am not that familiar with RAID.
Next, I'd scour the information about your motherboard that's available both from HP and from the maker of the motherboard. Let us know the exact make and model of your system and we should be able to locate a boatload of info about it. Is the RAM all DDR2 and are all chips the same size and model? Have you run Memtest86 on the RAM to check it? (free here: http://www.memtest86.com/
Finally, I'd do some in-depth checking of the settings in the RAID array to see if there's something there that's causing this.
EDIT: I have 4gB of RAM also (an MSI mobo), and haven't noticed any problem with the unrecognized RAM. I wonder if there could be an issue with the unrecognized RAM interfering with the workings of the rest of the RAM - haven't found an answer for that. You may want to try it with only 2 gB of RAM in the system to see if that "fixes" it.
Edited by usasma, 21 June 2007 - 05:49 AM.
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