Information processing apparatus capable of data communication and control method therefor

A control method for an information processing apparatus that is capable of communicating with an external device via two cables and that includes, a first connector that is connected to one of the two cables and that has terminals, which include one or more ground terminals and one or more high-speed communication differential signal terminals and a first terminal, separate from one or more ground terminals and one or more high-speed communication differential signal terminals, and that is arranged at a first position and receives a predetermined signal output according to start-up of the external device and are arranged in a predetermined arrangement, and a second connector of a same shape as the first connector that is connected to another of the two cables and that has terminals, which are identical to the terminals of the first connector in number and arrangement and include a second terminal, separate from one or more ground terminals and one or more high-speed communication differential signal terminals of the second connector, and that is not used to output a signal and is arranged at a position corresponding to the first terminal, the control method comprising:

• determining whether the second terminal receives the predetermined signal;
• and
• notifying of a message indicating that a cable of the two cables is reversely connected in a case where it is determined that the second terminal receives the predetermined signal.