Sounds like you have a stuck shutter or bad CCD. There is a temporary fix that works sometimes but eventually it will stop working alltogether. Canon can fix this or there are a couple of sellers on ebay that repair broken LCDs or shutters.
http://cgi.ebay.com/Repair-blank-black-pictures-S2IS-canon-powershot-S2-IS_W0QQitemZ300293064869QQcmdZViewItemQQptZDigital_Cameras?hash=item300293064869&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
OR
http://cgi.ebay.com/Canon-S2-IS-S2IS-NEW-LCD-SCREEN-REPAIR-REPLACEMENT_W0QQitemZ250358172189QQcmdZViewItemQQptZDigital_Camera_Accessories?hash=item250358172189&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
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