Already with an excellent example of G4 PowerBook 15" and 17", I started looking around for a 12", but particularly wanted an A1104 1.5GHz model, the last of the breed in that particular size. And one fell into my lap sooner than I imagined. And great condition too. Seen here perched on a newly acquired G4 iMac. With my inspector Clouseau hat on, as soon as the package was unwrapped I began wondering if the previous owner was a smoker, and if so probably left-handed too. Staining on the l/h shift and Apple Command keys - very likely caused by nicotine-stained fingers. I tried to remove the blemishes with a damp cloth and detergent, but no joy. Whatever stained them was pretty toxic and had removed the coating. They will be changed as soon as I can find replacements. The computer performed fine, as expected for this top-of the range model, but I'd noted that the fan was not as quiet as I'd expected. Seeing some tell-tale signs on the exhaust outlet almost confirmed my doubts that there was some internal contamination that needed some fairly urgent attention. And diving well inside, indeed firmly confirmed contamination of the fan exhaust. Cleaning is now under way, with additional comments to follow. --- Post Merged, Mar 14, 2017 --- Here's after an in-situ cleaning. Quite an improvement: I wasn't planning to strip any further, but will if really necessary. Can anyone please advise me how to get access to put one drop of oil on the fan spindle. If I remove the black sticker over the top of the fan with a blade, will that provide access to the top of the fan spindle? Or must it be done from underneath after removal of the fan assy and motherboard?