Chosen Solution

The camera turn on fine, the zoom button is ok, then I zoomed something, and the screen goes black, and ask for a restart.

the first thing that comes to my mind is a stuck lens. I would definitely start with trouble shooting that. Check this link and see if that will help you.

Hi guys, there is an eBay seller that fix Canon S2, S3, S5 and other SX models with lens error. here is the link in case you need: http://www.ebay.com/itm/141334025954