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my desktop mac start too long and stop,
[Re-Titled by Moderator]
Are you saying the your Mac will boot up but it shuts down by itself shortly after? Are you able to reboot immediately with the Power button?
If not unplug the power cord from the back of the iMac for about 15 seconds, plug in and try rebooting. If that works but it still shuts down by itself you have a failing power supply.
Another question, what year model is your iMac...?
How long is too long?
There is no compelling need to routinely reboot a Mac.
My desktop iMac boot time takes too long
