Why is there no internet connection after I installed MoCA devices?

Note: Slower speeds can be caused by a number of things.  
  1. Check the version of MoCA on your existing router or modem. When you mix different versions, the MoCA devices will have to work at the slowest speed.
  2. Having too much noise on the coax line can also cause interference.  
    1. This is caused by not using a PoE filter 
    2. Bad coax connectors 
    3. Failing or bad amplifiers for your cable service. 
  3. Ethernet drivers not up to date on your computers.
  4. Not having the most current firmware on your MoCA device