i have two roku XD boxes (model 2050x), and neither will do wireless now. same problem, error 14. started about a week ago.
roku customer service says that "error 14" means it's not getting an IP from the router once the wi-fi link is made, and, naturally, insists it's not their fault.
i tried what northernlight11 tried (connect via wireless while ethernet is plugged in) but it doesn't work.
all my other wireless devices are connecting to the same router without any issues.
i've gone through multiple resets, including pushing the reset button with a paperclip, power-cycling, and doing a factory reset in the setup screen
i've tried various changes to the router, including reserving IP addresses for the MAC addresses of the roku boxes.
nothing is convincing these units that they are getting connected via wireless.
they both still connect perfectly when wired.
i know one thing. i will be happy when it comes time to replace both of those televisions with sets that have built-in internet apps. because roku is not going to get another nickel of my money.