text: calling all computer geeks!? i just installed another 512mb of ram into my machine.  it is the exact same make and model as my other 512mb stick (samsung 512mb pc2700 333mhz ddr).  now when i throw a heavy ram task at it (microsoft flight sim 04), it crashes-even with the original defaults reset.  i have run a ram stress test and it comes back 100% ok.  what am i doing wrong??  amd athlon xp 3000+   2.17ghz  1024mb ram (64mb used for display) did your flight sim ever run on this machine? before you added the 2nd set of ramm?  with the pc utilizing 64mb for the video memory have you thought that it could be a video issue?  i know that in my machines i will never use the on-board video processor to handle anything, let alone games.  have you checked to see if all your bios is updated and all drives and firmware is good?  kinda a shot in the dark with this but thats where i might start.  also, check to see if there is a patch for the game running on certain chip sets/os/hardware configurations.