Originally Posted by Smartpatrol
It is in the BIOS it should be labeled limit meory for installation or something similiar make sure its off.
Thank you for your suggestions.
I went to BIOS, in "Memory info", it shows
"Installed memeory" is 8.0GB,
"Mmeory speed" 667Hz,
and each slot has been installed 1 2G memory stick. but the type in each slot row shows "Unbuffered". Is it the problem?