Ram Help...

[kaliburr]

i have a problem...my gskill ram was working just fine as of yesterday..
today ..according to windows and the bios ....1 of the memory slots isnt working?..
my mobo is the p6x58d premium and i called asus and i did everything that asus suggestied..
but still doesnt work,so before i send this back i thought i would ask u guys ur opinion.
(2) problem....while im in windows not running any thing my g15 logitec lcd say im using 0% of cpu
 and 36% of my ram....now there are apps under task manager running,and guit a bit of it
is the logitec keyboard and mouse...but 36% with nothing really running seems like a lot to me...
so let me know what u guys think....thanks so much..