Interestingly enough my first post after years of lurking involves a problem with my one week old powerbook (15" 1.67), and my first mac after 11 years of working with pcs. The problem I'm facing regards I think the hard drive. It started a few days after I got the computer. Someone referred to it in a previous thread but no one really gave an answer. My specific problem however is that the computer makes a strange sound constantly. Whether it's on a flat service or not. I think it's the hard drive. It's a constant granular ticking sound every 10 seconds or so. It started happening after I moved a lot of files unto it. I deleted my itunes library to free space but the sound is still here. Are there any defragmentation utilities, etc.? Is this happening with someone else? Thanks.