remove your cpu and see if any pin were benten.after this run msconfig and see your setting.follow the images...
1.click on start button then click on RUN and type "MSCONFIG"
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2.now the configuration utility will appear select BOOT.INI on the menubar
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3.see advance option on the top of "ok and cancel" click on this and another windows will appear now tick the first box and increase your memory to maximum level then click on OK and reboot your pc
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thanks.