When your Xbox 360 starts getting the 3 blinking lights than you must know that your Xbox is encountering to the most common problem that Xbox's have - Red Ring of Death (RROD). In official Microsoft announcement in January 2009, Microsoft admitted that every 10th Xbox sold is failing. That is a pretty high estimate - around 30 to 35% of the Xbox's worldwide. If this estimate is accurate then you can get the seriousness of the Red Ring of Death.
Let me tell you what causes this problem.
Microsoft made a design flaw on the Xbox 360 - the cooling unit inside is way too small, so the console can be easily overheated. When your console is overheated there is a big chance of getting the RROD.
However here's the question that most people are asking...
How to fix Xbox 360 RROD? Is there permanent fix?
Yes, of course there is. You can repair your Xbox at home by yourself. Many people consider that sending your console to Microsoft for repair is the best way to fix it but unfortunately it's not... Microsoft charges 140$ for the fixing which is almost a half price of a new one, plus the waiting period is 4 weeks. That's why the best solution is to use Xbox 360 repair guide to fix Xbox 360 RROD, you will save money and time. I highly recommend the use of this repair guide which includes step-by-step instructions and videos in order to easily fix your Xbox. You don't need to be technical expert to fix your console and the best part is you will get rid of the Red Ring of Death permanently. Your console won't be harmed or damaged in any case.
Here's the best Xbox 360 repair guide available on the internet, visit: http://xbox360lightsfix.com/ and get your Xbox 360 fixed in less than 1 hour.