If you have a desktop Mac with an obvious hardware problem, you no longer have to lug it over to your local Apple Store or authorized Apple repair shop. If you’re handy enough to do a repair yourself, you can now take advantage of Apple’s Self Repair Program, which has now been expanded to include the iMac, Mac mini, Mac Studio, and Apple displays. The Self Service Repair Store (which doesn’t look at all like an Apple website), requires customers to register, but once you do, you can order parts, buy or rent tools, and download repair manuals. Toolkit rentals cost $49 and you need to return th…