Unfortunately, I'm not sure about the WD drive, however the DirecTV box can often be reset by unplugging it (or calling up the service provider's troubleshooting department and having them reset or update the box) and this will often solve the issue with not getting a picture.
If you'd like to try resetting the TV, press and hold the EXIT button on the remote for about 15 seconds, and then click YES when prompted to "RESET?" appears on the screen.
I have a Samsung LCD TV LN55B650 for over a year now. I have it connected to a DVD player via component cable, a Direct TV HD DVR connected via HDMI, and a Western Digital Media Player connected via HDMI. All these have been working fine until this morning: the DVD player still working fine, but the Direct TV and WD media player both have no pictures displayed. However, I still can have the menus from both devices displayed and navigated, but nothing displayed when selected a channel. I think it may be related to one of the buttons on the remote control, but not sure. Please help. Thank you in advanced.