We received 2 brand new E7240s directly from Dell, one for myself and one for my colleague. As soon as I turned it on to build it for my colleague, I noticed the machine was overheating and the fan was making a noise. Dell suggested a BIOS upgrade which didn't change anything. They then changed the heatsink, again this changed nothing and since then they changed the motherboard. My colleague has gone on holiday so I don't know if her issue has been resolved, however, my laptop from day one does not overheat (as obviously as it did for my colleague) BUT THE FAN TURNS ALL THE TIME. So much so that I think the person in the upstairs bedroom is using her hairdryer. Dell replaced the heatsink and the motherboard yesterday, I have done the same BIOS upgrade and the problem is even worse. As soon as I switch the thing on, the ventilator turns all the time making a loud noise. My previous model was the E6500 and I wasn't bothered by any noises it made.
The 7240 makes so much noise that I want to throw it out of the window , seriously I am going to switch back to my 5 year old e6500 which is now very slow, I just can't take the constant hair dryer noise from the fan! I am waiting for Dell to get back to me but I don't see what else they can do.
I suspect there is a design problem with newer models, someone with a Latitude 13 Notebook has also mentioned it on the forums, also someone else with an e7240 states "I have noticed the fan running much of the time - it's quiet but you're aware it's spinning. I am just setting it up though, so the CPU is fairly busy." A person with the e6320 states "And the fan is loud and turns itself on way too often".