new ram ... big problems

..... got hold of some more pc2100 ram like I aready have .... the system says its there but when I try fs9, or any other game, after a few secs the whole pc crashes and re-boots ..... what have I done .... or not done?
Flight Simulator and other chat
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https://forums.simviation.com/phpBB3/viewtopic.php?f=9&t=23639