It must be something with the display adaptor, it's the only solution I can come up with. If I can ever figure out how to re-enable the integrated video card and disable the ATI Radeon HD 2400 Pro, I think I'll try that.
Caroline is really emphasizing that she feels I should brave trying to deal with Dell tech support. What are they going to know about screen readers? I've got an e-mail in to Freedom Scientific, in which I have told them everything I can think of that might possibly be relevant. I can't call them from work, and besides, they work during the same hours I do, basically. This really sucks. First I unknowingly buy a computer that can't be expanded with the goodies I bought for it, then the thing won't even work. It's enough to make a grown man cry, but as it is I feel like such a bungling fool, utterly unable to get the slightest thing right. I feel very much like a money-wasting failure.