I purchased an xbox 360 from somebody on craigslist for cheap. Asked if it had any problems, he lied and told me no. Does not boot and has the 3 red lights. Not too happy about this, but trying to make the best of it. I dissasembled the system, and when I shake the motherboard it makes a rattling noise, I figured out that the guilty component is SWG21 (it is near the memory card ports) is it normal for this component to make a noise? I took off the heatsinks and noticed that they have almost no thermal paste. I don't have any artic silver on me though, so I cannot rule that out as the problem... Also. If I was to contact Microsoft and pay them to repair the system, will they do it even though I've opened it? I know this voids the warrenty, but will they refuse to work on any system even if I pay?