Well in terms of video mode switch...no. The Xbox is coded to either be pal or ntsc output by default, depending on the region you bought it at. And there are no physical mode switches under the hood. To replace the a/v outputs on the xbox, you must have a steady hand at soddering and be able to recognize various leads on the xbox motherboard. You can pickup standard a/v output leads from any Radio Shack or other hardware provider. Again, this is just speculation. There are literally a plethora of possible reasons as to why the xbox displays no sound or video. The flashing lights are just the xbox's way of saying "Hey dummy theres no a/v for a reason, FIX ME!" I would consult with a tech professional in console repair or speak to M$ directly. They may be ablt to fix it for you cheap.