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This is fairly common, especially if you are moving quickly in left 4 dead. It is maxing out the Xbox 360's capabilities and once and a while will get a graphic glitch here or there. Make sure your xbox 360 is well ventilated and is not overheating. This could cause this as well, but since you say it's only in left 4 dead this is probably not the case.
Replacing the Power supply unit, PSU, is very simple. It is about 4 screws in the system. You can pick up a replacement on ebay for $10-20. Also, a new (used) xbox is usually around $30 on craigslist. Hope this helps.