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Upgrading Ram


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I tried upgrading my ram from 2.5GB to 3.0GB, Have 2 1GB in first bank and 2 256MB in next set of banks for a total of 2.5GB.

But when i removed the 2 256MB and replaced them with 2 512MB, the pc and online scanners only recognized 1 GB in the first bank and saw the 2 512Mb in the other bank for a total of 2GB, swapped out the first 2 1GB sticks with the same result, only recognized only 1 GB stick and the 2 512MB sticks. Replaced the 2 512mb sticks with the 2 256Mb sticks and went back up to 2.5Gb, online scanners and windows both saw the 2.5gb. Any help or advice would be greatly appreciated. Here is speccy showing 2.5 GB http://speccy.piriform.com/results/1rta2JmKiciDIWbcsgw3T3c and here is speccy with 2 1GB and 2 512MB of ram. http://speccy.piriform.com/results/6ZeqN8i5fZQ2qoqXU3acOxk and here is the speccy with 2 1gb sticks and only 1 512mb stick. http://speccy.piriform.com/results/lC5SuHOtq3wPjyieIFINLlO

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I found out the problem, but am so embarrassed I don't want to say what I did to fix it. But now I have the 2 1gb sticks in the first bank and the 2 512mb sticks in the 2nd bank being recognized for a total of 3GB, here is the speccy, http://speccy.piriform.com/results/xWcoAIgNrrL0JRivorZvkhD but I still cant figure out why windows and online scanners didn't see that 1gb stick before.

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I got a pencil and used the eraser on the 512mb sticks, these were 2 more that when I stuck them in the pc, it didn't boot at all, so I pulled these 2 out and rub the eraser on both sides of the contact's till they glowed, did the same on the other stick. Placed them both in the computer, and as soon as I saw maxmem icon with the green line way at the bottom I knew it was recognizing all the memory. Well hoped this might help others too.

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