On light is "on" but there is no heat, thus no steam

this is fixya we are not associated with rowenta ==you need to make your request thru them we have no access to yours or their accounts

Try draining out water and refilling it. sometimes there are deposits blocking

Customer support of Mr Steam

depends on how old it is, try to rinse it with a water and vinegar solution, this might help

Plugged in? Add water? Check the fuse on the power cable.

To troubleshoot something like this.
1. make sure it's plugged and the outlet is working.
2. Is it getting hot? If not, either the heating element is burned out or not getting power.
3. If it is getting hot check the steam ports for calcium build up (run straight vinegar through it)

Tap water contains minerals/chemicals, whether it's from a well, or from a city source. When water is heated to steaming, these minerals, precipitate out of the water and form deposits. Use some vinegar. The mild acid will help loosen the deposits... and from now on use distilled water.

Seems silly... but is it plugged in to a live outlet? Does it have water?

It could be broken but it could also be jammed or clogged by some dirt or water. My first answer would be to get a new one. but if you dont want to throw it away you should take it to a recyling store.i know that is getting rid of it but it is not exactly because you still remember it.