trying to upgrade ram

i have just purchased a new stick of ram, put it in my laptop and it has registerd as 256 when it should be 512, i have tryed it in both slots and i have tryed the original 512 stick already in the laptop in the same slot by itself and it registerd as 512? why is this happening and how can it be fixed?
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unrealone1Asked:
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MarkConnect With a Mentor Commented:
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jamietonerCommented:
Looks like i was the slow one this time.
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MarkConnect With a Mentor Commented:
This may explain the density issue a bit better.
http://support.gateway.com/s/tutorials/Tu_851378.shtml
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