I use my computer for recipes all the time, the music stand is new. I’m surprised my keyboard isn’t totally clogged with flour by now, but it’s been working out fine so far.
About the bananas… they’re not that brown on the inside, but they do totally look gross, I’ve called it banana poo before (seen here), but they’re definitely okay to use. I don’t know how much the taste changes, I’ve always been a fan of a little-over-ripe bananas, anyway, but whenever I’ve baked using the frozen bananas, nobody complains. Sometimes you can find well lived bananas in the reduced section at your supermarket, but also some women at work give me their old bananas (sometimes hoping to eat them once they find their way into the oven). It’s a great way not to waste!!