Then on the face of it the chip is either damaged or it's the wrong type. If it works in one PC and not the other it clearly isn't damaged. That only leaves one conclusion as far as I can see. Did you follow the Crucial guidelines and get your chip from them?
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.