I've had this problem since FS2004 was installed (I did not have this with FS2K2).During flights, my CPU fan will increase in speed so fast, that it becomes quite loud. I understand the need for the speed increase - to cool down the processor that's heating up due to the CPU load.However, if I start FS2004, choose select a flight so that you see the default plane spinning in the lower window pane, after about 30 seconds, the CPU fan will increase in speed.Placing FS2004 in windows mode so I can use the Task Manager to show the CPU/Memory usage, the memory usage is low, but the CPU is at 100%.Why is this happening?I'm concerned that the processor will over heat.I've not overclocked the processor.Environment:Windows XP768MB RAMNvidia FX5200Use Enditall to close all applications before handJerryG

Sounds completely normal to me. FS is a hard taskmaster, and it will push your computer harder than anything this side of CAD/CAM or video editing. You can't damage the processor, it will shut itslef down before it fries.Allcott