In a Dell Precision server, there are 8GB RAM. The OS is Windows XP 64-bit.
Originally, everything is working fine. Both BIOS and Windows are able to detect 8GB RAM. One day when I power up the server, the BIOS shows a message "the amount of system memory has changed. Press FX to continue". After the server finished booting up, Windows shows 4GB RAM only.
I rebooted the server and checked the BIOS. In the memory details page, it shows 4GB RAM in the summary. But below the summary column, it shows that it detected 8 x 1GB memory sticks in the system.
I have installed Speccy in Windows. It also detected 8 x 1GB RAM. But Windows's system properties window only shows 4GB.
Why the BIOS suddenly fail to detect 4GB RAM? Is this a hardware failure? How can I activate the inactive 4GB RAM? Thanks.