Problem with tv out

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I cant have video anymore on my tv screen when i use the tv out and bsplayer.the only thing i see on my tv screen is my desktop.i do have video on my tv with other media players but not with bsplayer.and i do have video on my pc monitor using bsplayer.I installed different versions i changed the tv out options from clone to dual view and nth happened.i have an msi 7600 gs graphic card . the strange thing is that i had no problem till now (i could see movies on my tv using bsplayer) and as far as i remember i havent done any changes to my system . no new drivers no settings changes . The problem just occured ! Can anybody help ?