Hello. So this is really weird. I have a (late 2008)MBP 15in and sometimes, very rarely, when i turn it completely sideways to where the power button is closer to the ground then the other side, it makes this weird sound that sounds like liquid trickling down stones..... I think it could be the fan by the video card hitting something when i turn it sideways but it does it very rarely so i don't really know. Any suggestions?