New RAM

[andy37142]

I know I have 512MB of RAM installed and always have ever since the machine was built. When I boot up the first Windows screen tells me I only have 128MB RAM. Do I have a problem somewhere in that it only recognises 128MB instead of 512MB RAM. If I buy another stick of 512MB RAM will this significantly increase system performance or will it not make a lot of difference (machine capable of 4 gig RAM).
Thanks
andy37142:)

[Spearball]

Did you build the pc yourself or was it built for you?

Download http://www.cpuid.com/cpuz.php and check and see how much ram it says you got. If it still tell you 128mb installed i would open up the case and check to see physically how much ram you really got. Last but not least, if you checked and really do got 512, try reseting your bios by removing the cmos battery on your motherboard for about 5 mins, put it back in and reboot the pc to see if it changes anything. (Be sure to shut off and unplug the pc before removing the battery)