I have been doing some research on the "micro" HDMI video and "micro" usb cables. There are several sizes or "types" of each of these cables. For the Photon 4G (and the Atrix, and EVO 4G but not the EVO 3d) the cables you need are as follows:
For the HDMI cable you need a "standard" type "A" connect to a "micro" type "D" HDMI connector.
For the USB cable you Need a standard usb to a "micro" usb type "B" connector. (not sure what they call the standard rectangular usb connector).
These cables vary WIDELY in cost. In stores they often want $40 for the Micro hdmi cable. They have them for under $7 with shipping on amazon and Walmart online (not in-store though).
Hope this helps. Please correct me if I am wrong.