I have a P 4 3.0 Ghz. system on which I want to increase my memory. Currently that system is running smoothly with a Corsair DDR 2 1GB 667 Bus Speed Memory stick combined with a Twin MOS 256 MB DDR 2 stick. Giving the system a total memory of 1.12 GB. However, now when I try to run a Kingston 2 GB DDR 2 667 Memory stick with the Corsair one, what the system does is that it only detects the Kingston memory and gives me a total of 2GB memory instead of 3 GB. In the BIOS the slot with the Corsair memory stick gives a "Not Installed" message. I have tried all possible combinations of switching around the slots and also checked the two sticks individually. They both work perfectly when run individually.
Any suggestions on what the problem is? All help will be greatly appreciated.