I've owned 4 iMacs in the last 13 years, and they all (except my current 2017 model) had fan noise / overheating issues after 2-3 years, which is why I replaced them. I never noticed the screen issues, but will pay more attention with my 2017 model. If it starts having problems in the next year or two, I may no longer buy iMacs.
Did that error message end with "The value is missing."? If so, it appears to be a fairly common problem (do a Google search for "iTunes could not connect to this iPhone") and you'll get a ton of "iTunes could not connect to this iPhone. The value is missing." hits. The error is frequently also involved with inability to do system restores. Here's a link to a fairly thorough answer applied to iPhone 6 and later iPhones. Perhaps it will help. https://www.imobie.com/support/fix-itunes-could-not-connect-to-this-iphone-the-value-is-missing.htm
It really depends on how you had iCloud set up on your previous iPhone(s) or other iThingies. If you have your iPhone set up to back up your photos as well as system critical data to the cloud, it should be simple to get your original stuff working on the new iDevice. At some point in the initial setup on the new device, you are given the option of authenticating to your Apple ID (you need to be on either a wireless (preferred) or cellular data connection ). If your Apple ID is accepted, you are given the option to restore your previous iCloud data to your new device. If you select yes, it will likely take quite a while - depending on how much stuff is being restored - but things should work quite well once the process completes. This is actually one of the best things about hanging out in the Apple "walled garden". As long as you stick with Apple devices, migration is simple.
Well, not quite enough information to perhaps help you with an answer. A few questions: What device / computer are you using to connect to the wifi network? What system is the device / computer running? MacOs, iOS, Android, Windows, or Linux? Anyway, someone might be able to help you if you can furnish us with a few more details. As a stab, given no real information, it would appear that your wifi networking interface is defective, or perhaps you are having issues with a network device driver or some such. Sorry, that's all I can suggest at this point. Did you do something significant to your device / computer a week ago that may have contributed to this problem? Happy Holidays.
Mobile devices - phones, tablets, and laptops - are physically hard to assemble just due to the small form factors involved and the special tools needed. If it's a newly designed/patented device, especially by a proprietary company like Apple, spare parts on the open market will be hard to come by. The so-called "hackintosh", where mix-and-match PC parts are used to make a computer which can run MacOS, has been around for some time, but once the hardware is assembled which can run an existing version of Apple's OS, it often happens that a patch or system software/firmware released by Apple will cripple your hackintosh creation. It's consequently rather an expensive, time consuming hobby. You might actually save a little on hardware costs, but once you factor in the hours of time needed to construct and maintain a functional, up-to-date computer which will run a current MacOS release, the little saved on part acquisition is much outweighed by the labor outlay. Apple phones and tablet hardware upgrades,...