I have exactly the same issue that Ruzsi has described. All related services appear to be running, but no visibility of Bluetooth connectivity anywhere in OS. I also have a E6520 with exactly same OS and Bluetooth is working a treat. I have also tested with several different Bluetooth devices. Nada.

Your thoughts DELL?

E6540 / Win 7 Ent / 64 bit / 16GB / 128 GB SSD primary / 1 TB Hybrid ATA secondary HDD in DELL caddy, in DVD bay

I had the same question having just come from a 6510 with inbuilt bluetooth.  In the user's guide for this laptop I found the following disappointing instructions:

Connecting a device using Bluetooth
Before you can add a Bluetooth-enabled device to your computer, you must do two things to make sure your computer and the device are ready to connect:
1.
Add a Bluetooth adapter to your computer if it does not already have one. You can do this by plugging the adapter into a USB port.
2.
Set up the Bluetooth-enabled device so that your computer can find it.

So, that appear to be the problem folks. 

ler

Hi Ramseyhere. 

It turns out that my laptop didn't contain a bluetooth capable wifi adapter (even though it was ordered with one). Please note, this was NOT Dell's fault, but was our Vendor's fault - we received a batch that only half of them had BT functionality. Our vendor ordered replacement adapters and we installed them. All good now.

Good luck.