Pumpkin, re your potatoes and beans.
Microwaves can be quite tricky to use, because they don't heat in the same way that ovens do, so it's not really surprising it didn't cook in the time you gave it.
Potatoes are large solid objects, and are going to take a comparatively long time to cook in the microwave, compared to small soft objects like baded beans. So you can't put them in all at the same time and expect them to come out nicely.
If I wanted to cook a really nice baked potato, I would begin by pricking a few holes in it with a fork, and then cooking it in the microwave for around 5 mins. I'd check to see if it was just soft, and if it wasn't, I'd give it another minute, and then another minute, until it was just soft in the centre but not unpleasantly squidgy. It might take between 8 and 10 mins to do one potato. Then I would put it in the oven, pre-heated to about 200 degrees c, for around 10 mins to crisp up the skin. If I felt like it, I might dribble a teaspoon of olive oil on the top and rub it over before it went into the oven, and put a few grains of salt on top. You don't need to do them in the oven at the end, but I think it's much nicer.
You were doing two potatoes - two potatoes in a microwave need more time than one potato, so I'd probably up it to about 8 mins for the initial cooking time, and then check repeatedly at minute intervals.
I've not done baked beans in the microwave because I find them easier to judge done on a pan on top of the stove. But I'd put them into a bowl and give them about 1.5 mins, stir thoroughly, and then give them another 1.5 mins, and then check to see if they were heated through.
Does that help a bit?