The fan is operated by a circuit containing a thermistor - it spins up when a temperature setpoint is reached. That's the wire you disconnected -- without it, the fan won't spin at all. The only way you will achieve what you want to is to wire the fan to a USB port outside the case -- that will give you a constant-on fan.  There is nowhere you can wire the fan internally to do that.  
Hello everyone! Just got my hands on a very nice E6410. Fresh install and grabbing drivers for it - it's my first Latitude laptop, and I must say, very sleek! Not quite the Latitude I wanted but still, very cool. Now, one annoyance I've found with the laptop, is a lack of ability to be able to control the CPU fan - it seems to have a mind of it's own, and it ramps up/down whenever it wants. Typically with the way I use computers, I like to be able to have control over this, you know, to keep temperatures down, and help with performance. Previously what I've done with computers where the BIOS doesn't provide any fan control options, is physically disconnect fan pins which are responsible for regulating the speed, and make the fans default to max speed constantly, it might be overkill for some people, but I am totally fine with it - I have plently of background noise where I am anyway, so something like a fan is hardly a disturbance (especially considering how I am pretty much always wearing headphones anyway...). I actually took some pictures of the inside, but can't see a way to attach photos here, essentially the fan connector has black, yellow, red, blue cables. Here's some pics of an identical one I found on the internet: [URL] Would anyone happen to know which colours might be the ones I need to disconnect? I am removing the pins from the connector "non-destructively" which is rather tedious, so far I have only tried with the blue pin removed, and it seems that this stopped the fan completely, so clearly that's an important one. Don't really want to try them all manually, so thought I would ask here first. Many thanks in advance!    
Latitude E6410 CPU fan wiring