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Message: <blockquote data-quote="MacInWin" data-source="post: 1870482" data-attributes="member: 396914">Frank, reboot is essentially just a restart of the system, no resetting of anything. To do the rebooting, the best way is to click on the  in the upper left corner, then Shut Down... in the resulting window. That action will turn the machine totally off, closing all programs. As I said, in the shutdown dialog a box opens to confirm you want to shut down and in the box is a check box for Reopen Windows that you want to make sure is NOT checked. If any application has a document that needs saving, it should tell you that and allow you to do that before it quits it and shuts down. Once the machine is totally off you can wait a few seconds and the press the power button to start it up again. On the iMac, that button is behind the screen on the lower left side, I think. I don't have your model iMac but that's where it's been for a few models I do know about. Just a quick press on that button should power it back up. You will be asked to enter your password to log into the system, so be prepared for that. As for the other stuff...all of those processes you see in Activity Monitor are part of how the system operates. There can be hundreds of them (right now I have 516 processes, 2,000 threads running), some with the User being you, some with the User as "root" and some as "system" or even some as other applications. The only ones to worry about in that list are any that are taking a lot of CPU, or Memory or that have turned red color, indicating they are not responding (typically that means they are hung up somehow). You can sort the columns by clicking on the header of each column to sort the entire table by that column. That's handy to get the "heavy hitters" to the top of the list. Also, on the Memory tab there is a graphic showing "Memory Pressure." That is a simplified view of how hard the memory is working. Normally it's Green, occasionally it may go yellow. Anything above that is way over normal and the system will be affected.On the Dock (assuming it's on the default bottom of your screen) all of the running apps will be displayed as icons, with a small dot beneath them (or beside them if you moved the Dock to the side edge). That means they are running. You can close them independently by right clicking (or CMD & Click) on them and a menu will open, with one option to Quit. The macOS is based on Unix, which is a multi-user system, so it approaches things differently than Windows does. The red X, as I said, pushes the application into the background, still running, for the most part, the yellow X minimizes the application to the Dock and the Green X will change the size of the window from full to partial screen. Some apps do actually close with the red X, just to make things interesting, but I consider everything still running unless I quit it with the menu. To actually quit an application, you use the top bar menu as I described. There are also some keyboard combinations to perform some shut downs, but the top bar is my preferred way, so I don't know all the keyboard shortcuts. Games can be memory hogs. I don't recognize the game you mentioned, but in general games are heavy hitters on both calculating and memory. Come back with any questions, we've all been there...</blockquote>

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