Hi everybody. So, the other day, I was on my iMac doing some work, for quite some time, I would say maybe 6-7 hours, and suddenly, the mouse started to play up and whenever I was pressing a document on my desktop, it was adding all the clicks together, so I would have many files and documents clicked together. Then I restarted the computer, and the iMac was turning on very very slowly, you know, that line that has to pass to the end in order for it to turn on. Then I realized on the top right of the screen it said boot mode in red lettering. I was very worried, and I turned the iMac off. Then after a day, I turned it on again, and it had gone and returned to being normal. What in the Hell actually happened? I found out online that turning it on and off will solve the problem of boot mode and thats exactly what happened. But I am still worried. Why did it go into boot mode and have that problem with the mouse? Is my iMac slowing down and losing some of its power? Thank you.