Hello Ema, Friday, May 14, 2010, 8:40:49 AM, you wrote: Eac> I just went into the other pc it says chasis fan speed is too low It could be a build up of dust but often if this has got to the point where it's slowing down a fan to the point that the low speed warning is triggered then blowing the dust away is only a temporary cure as the bearings will be shot and it will then get very noisy soon, been there many times <lol> Worth opening the PC case to have a look inside and if it's really choked up with dust then that can of compressed air will be able to blow most of it out - do this outside though, and stand upwind <lol> Just a few points about these compressed air cans and computers :- Don't use the plastic tube that fits in the nozzle as this increases the air pressure enough to blow components right off of circuit board and you really don't want that ! Don't blow into a fan without holding the blades to stop them from spinning. The air from these cans will turn a fan at a far higher speed than it was designed to go. Always hold upright, if held at an angle it can send liquid through the spray and this too can cause damage if it gets into the wrong place. Overall, if you feel unsure about all the above it's better to trust the job to a local tech who will be able to clean up things and replace fans that are failing. -- Best regards, Barry mailto:[email protected] MicroSoft Free Zone running Ubuntu 9.10'Karmic'