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That's an interesting problem. When you say "flicker" are they flickering on and off, or just dimming a bit? My guess is that it's a problem with the voltage regulator on the alternator, or a problem with the alternator. Could also be a weak or bad battery, but I think you would have problems starting the car too. Check your fuse panel too to be sure they're all in there tight. If one is loose and rattling it could cause an issue like you describe.
It could be many things. I would start by checking the Battery. Even if you're seeing lights and power accessories working there may not be enough juice to turn the engine over. If your battery is over 6 years old, especially if it's cold out, then you probably need a new battery.
If the battery is VERY dead it may take quite a while jump start the car. You may have to run the car with the good battery for five or ten minutes to get enough charge in the old battery to start the car. Other wise a very dead battery will just "soak up" the electricity from the good battery. If your battery was old to begin with it may be unserviceable. I would take the battery out and take it to an auto parts store that can charge and test it. They will usually do this for free.