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Basically, the title. It's an old Toshiba flat screen. I successfully "taught" the keyboard the power button code. The keyboard will turn the TV off, but not on. The power button on the remote is just one button, a toggle, like normal. Of course, the remote will turn the TV on and off, by pressing that one button. I can't imagine what is wrong, it must be the same code for on and off, right? I mean, the things aren't that complicated.
Thank you.
EDIT: It works if I program a button on the keyboard other than the power button. So I programmed button "C1" as the power button and for whatever reason, that button will turn the TV on and off. Weird. It's the keyboard treating the power button differently.
Some manufacturers made all sorts of different codes for instructions between various models of tv and remote. That includes some different TVs only sharing an 'on' or 'off' code and not the other.
It's why many 'universal' remotes will tell you in the instructions to keep trying different numbers for the manufacturer until all features work. So... you'll have to do that. Try all Toshiba TV codes that remote knows. If none of them support all features, hopefully you can tweak button by button!
I believe this is the answer. If you can turn off the TV but you can't turn it back on then you're probably just using the wrong code.