Broken usually means that something needs repairing.
That is the case with a broken computer. It would also be the case with a car, but most cars break when they're out on the road, so we would normally say my car has broken down.
I disagree. There is a difference between saying..
- My computer is broken.
- My computer needs to be fixed.
If my computer is broken, I might fix it. I might throw it away and get a new one. I might just live with it.
If I say my computer needs to be fixed, I am specifying clearly what response I am considering to the state of my computer.