Just got a new Macbook Air, upgraded RAM to 8gb, 256 on the hd. love the machine and the screen is great, but i notice a metallic ticking/creaking once in a while when i pick the machine up and move it with my hands. could be one hand, could be two hands. apparently this is due to some sort grounding device under the bottom cover and the machine heating up and the bottom cover not being on proper. lots of people say to give the screws a tighten or to take the machine in and have a genius do it. my question is: if i just let this go will there be any longterm damage? i feel like i got a good machine otherwise, but there is this one annoying thing. wondering if it's worth it to care. kinda over going to the apple store. also, do a lot of users notice these creaks when moving their machines around as well? is this a common thing with the build still?