Unresponsive remote ?

Possibly a knackered remote. There's a quick way to check. Use a digital camera or mobile phone camera to view the IR LED at the business end of the remote as you press a button. IN the camera viewfinder, you sholuld be able to see the IR LED flickering - try it with a known good remote and you'll get the idea.

If it's knackered, prosbably a quick sojourn to EBay is in order.

XX
September 2015