Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
Thank you for your detailed reply. I have done exactly as insturcted, but the highest CPU use is just 2,3 and it's something called 'kernel task'. Nothing higher than that.
This problem first started, when I deleted back ups from over 12 months ago, which were clogging up my back up hard drive. I only deleted the 3 oldest back ups, not sure why that seem to have caused me this problem, but it appears that my shut down issue has something to do with me deleting the back ups. (??)
Thanks in advance!
I mentioned 'the highest CPU use is just 2,3"' because I looked in the actual CPU column and there is gives the usage percentage, so the highest number I saw there was 2,3.
However, there is a column next to it, called 'threads', there the numbers are higher. However, the CPU percentages range between '0' to max 2,3. In any case, I probably ,isunderstood something as yoy mentiioned that I should look for 'CPU time'. Which column shows the CPU time then. The screen shots I attached in my previous message pretty much show what I can see and the usage of various programs I have running. Please have a lookand advise- thanks!