A reset back to factory default settings may help. Offhand I can't say how to do this for your particular model, but no doubt that's what they will tell you to try if you call Technical Support. Failing that, they will want you to send it in to them, or take it to an Authorized Service facility. You may want to consider the possibility that it really has had a failure and won't pass self-test, and never will without repair. In that case swapping it for another unit at Best Buy may be called for, or if you are concerned that the next unit may have a similar failure, getting your money back and looking into other models.