I also have some personal techniques that make homework seem fun or trick my brain.
First, I would imagine that if I don't finish my homework, a burly man will beat the cr@p out of me.
Also, I'd imagine homework like a videogame where I must complete it in order to rescue the princess...or prince in my sake.
If you really need help and can't help yourself over computer games and still live with your parents, get you mom/dad to set up parental controls and block every gamming site and stuff not related to school such as chatrooms, facebook, twitter, etc.
And take my advice on rewarding yourself when you are done/mostly done if the homework is long. You deserve some self encouragement so you don't bore yourself. If you are too bored, you will procrastinate, and if you procrastinate, you will never get your work done. Just be sure to ration your reward (if you decide to stop during your homework)like 10 minutes of break (let your parent/guardian time your break for you in case) and have a quick snack.
And I agree on listening to music, it helps calm your mind. I suggest some upbeat pop that will make you happy.