Cotton has a 2013 MacBook Pro, and recently had to buy a battery from MacSales.com because it began to swell. He also replaced the SSD. He had to remove the battery with acetone because it was glued in. But after installing it, the laptop was dead. Leo says to head over to iFixIt.com and check out their instructions on replacing the battery in his laptop. He may have missed a step. But it's also very possible that Cotton may have shorted out something like a fuse.
LeBaron has a 2010 iMac computer that is getting very slow, and Leo suspects that the culprit is a failing hard drive. The upgrade is non-trivial, but it can be done. Leo recommends going with a solid state drive to make it a heck of a lot faster. Then connect an external drive for the data. What Leo recommends is going to Otherworld Computing and look up the model. You can see what parts are needed, along with tools. Then decide whether to try to DIY or to have it done by a technician.
Mike is looking for a dock for his MacBook Pro since it only has the one USB-C connector. Leo says that he uses one from Other World Computing. Apple has confused everything with USB-C because it can connect to Thunderbolt 3 or USB 3, and it really doesn't specify what works and what doesn't. On top of that, there's only one port.
Luis has a second generation Mac Mini and the hard drive crashed. The repair techs want to charge him $350 to replace it. Leo says that's nuts, and he can do it it himself. Macs require special tools to open it up, though, because they use friction to keep things together.