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Message: <blockquote data-quote="jpdemers" data-source="post: 1892285" data-attributes="member: 117810">That solder blob suggests that somebody else has been mucking around in there ... never a good sign!The power supply should be silent, but coils, transformers, and capacitors can whine if they have loose bits and hit a resonant frequency.  It's rarely an actual problem, but it can be annoying.  Press on the various components with a wooden stick until you find the one that can be silenced.  A blob of silicone sometimes does the trick, or you can replace the component.   Replacement (used) power supplies are about $50 on eBay.Re the drive, you should be able to install any SATA HDD or SSD, but it will be missing Apple's temp sensor, which means the fan will run full blast until you install a fan control utility.</blockquote>