Start up problems
turned off itself and when i start it up it shows apple sign and then turns off again.
iMac 27", OS X 10.11
Occasionally this can be caused by a 'conflicting' peripheral device's connection. Try disconnecting everything and restarting. If that works ok, then add back each item one at a time and restart. When the problem recurs, then you know where the problem is - specifically which connection is causing it. Then you can reconnect the device on another port. Good luck.
