An orange flashing light on the keyboard remote, even when no keys are being pressed, indicates that it is no longer paired with its USB receiver.
To re-synchronize the keyboard remote, follow these steps:
1. Turn off the remote.
2. Press and hold the F1 key without releasing it.
3. While holding F1, turn on the remote, then release the F1 key immediately.
4. Wait a few seconds for the keyboard remote to reconnect. The light should stop blinking.
5. If the issue persists, repeat once again steps 1 to 4 if the light is still blinking.
If the keyboard-remote is still flashing, repeat the procedure but including these additionnal steps:
Disconnect the USB receiver connected at the end of this USB cable.

Turn off the keyboard-remote.
Press and hold the F1 key.
While holding F1, turn on the keyboard-remote, then release the key immediately.
Reconnect the USB receiver removed at step #2.
Wait a moment; the keyboard-remote should reconnect automatically.
Note : You can also use this procedure to turn on the computer if it was turned off.