@absimthe Well, I don't know about the PS3 issue, as I've never played on console. However, usually on PC there are ways around such issues using console commands (it's not cheating if you're just getting around a bug), although it may sometimes mean you missing some bits of the story (such as conversations) depending on the options.
Is the bug you're having with the Origin part of the story (before going to Ostagar) or later on, when you go to recruit the mages or templars?
For the mage origin, the debug script is zz_bhm_debug, for the tower quest later in the game it's zz_cir_debug. Use these codes at your own risk (and save beforehand), but I'm guessing you don't have much to lose if you're stuck in a basement and can't progress.
Are you using mods in your PC game? Some mods can cause bad bugs or break the game, so might be something to think about.
Hope that helps, let us know if you have questions or any other issues. 🙂
