Then please do not post using tinyurl links and offer more detail. Source, conditions, etc. so that people who may have seen the same contest don't repost it. Also, referral links are not cool. If you don't want to come across as a spammer then don't do what spammers do.
Not to derail the thread, but I had a similar issue and after doing some homework on it I found a trick that fixed it.
I opened up my Xbox (warranty was long gone anyway), got into the disc drive, cleaned it out with compressed air. Remove the drive belt. Get a glass of room temp water and a...