If you used the old hard drive from the D810, you may have pushed too hard to get it going, but you probably just have drivers problems.
You should go to the
www.dell.com website and enter your service tag that is found on the bottom of the Dell D810. ALL Dell driver downloads are free, but it is sometimes tricky to learn how to do it.
Then download and install all relevant driver updates.... there could be as many as 77 drivers, depending on your model and configuration... but only a few (3 to 7) will be needed to fix your system.
If your bluetooth device is a Dell, install it from the Dell site. Otherwise go to the website of the makers of your bluetooth and for the other wireless units that are connected to the Dell.
First time installers can find this a difficult and frustrating process, so you might look for an experienced friend who has the time to help you do the first install.
If you tell us all the components, we can perhaps be more helpful. It would be good to know the service tag, and the brand and model of Blue tooth and Wireless, and your connection to the internet... by brand name and model number of wireless device.