If you’re saying that you switched off the WD Player because it wasn’t responding then I doubt you hard drive is at fault. No doubt your WD Player didn’t cleanly shut down. There should be a small rest button underneath your WD Player although I guess it depends on the exact model you refer too! My reset button doesn’t work but I have found that pulling out the power supply at the back of the unit whilst it is still on and waiting 5 minutes works wonders.
Start with the simply approach first and if that doesn’t help try what ‘ncarver’ suggests and check your drive. It might be that switching it off ‘mid-play’ has some how corrupted your movie.??
