I’ve seen this happen if you’re “chasing” a live TV broadcast (that is, you’re some amount of minutes behind the actual live broadcast, having previously Paused it). FF reaches the actual live time and the display shows the speeds but does nothing (because it cannot FF beyond live time).

As Graham says, what are you trying to fast forward ?

Push the forward skip button twice, average ad break is 4 mins (under search button). If you overshoot back up in 15 second increments – reverse skip key under recordings button.

Odd the fast forward didn’t work though.

You can also skip forward and back using the left right keys either side of OK.

two simple things to try first,

if you have a digital camera or even easier a smart phone with camera, point the remote control at the camera, press the remote buttons and you should see the remote control LED light up on the camera display, check that this works on the fast forward button.

If you don’t have access to a digital camera or smart phone, swap the batteries in the remote.

Sometimes when the batteries are on their way out, there’s enough power to operate some of the buttons, but not all, so swapping batteries for known good ones is always worth a try.

If the fast forward button doesn’t light up on a camera and other buttons do and you’ve swapped batteries then the button contacts in the remote are most likely dirty and need cleaning, easier said than done, which is why it’s worthwhile testing with a camera or renewing batteries first.

If these two tests don’t help then there’s clearly something else going on, let us know.