Lost internet connection

Since there's no network adapter connected to your HR24, I assume you have Whole Home DVR service?  Have you tried resetting the HR24 using the red button behind the front panel access card door?  Do you know where your WHDVR Cinema Connection Kit is located?  The CCK bridges the WHDVR coax DECA network to your home ethernet network.  It might need resetting. 

If you can locate the Cinema Connection Kit (see picture attached) you can reset the system thus:

Disconnect the CCK from the DVR but leave the AC connected. Use a ball point pen to reset the CCK in the small hole on the back. Check that the router has DHCP enabled (essential) and has no MAC or firewall enabled. Assure that the network name and password contains no symbols other than numbers and letters. Disconnect AC from the router for two minutes then re connect. Reconnect the coax to the DVR only (not the CCK) and do a red button (inside card door) reset of the DVR.  When it's all booted up do thus: Menu -> .....setup -> system setup -> network setup -> restore defaults -> Your system is now clear of any previous settings. Connect the coax from the CCK to the DVR, wait until the invitation appears and select your network and enter the password. You may get an invite to connect, is so, accept.  If not, dothus: Menu -> .....setup -> system setup -> network setup -> restore defaults -> connect now. You should get a "connected to Internet" message. Allow 24 hours for the system to download then try downloading a concert from channel 1239 as a test.