HT201177: Get help with video issues on external displays connected to your Mac

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Q: my iMac turns on but won’t stay on

I can turn on my mac, the beach ball starts spinning and stays spinning for awhile, finally                                                                                                                                                                                                                                                                                                                                                                                                                              starts up but then quickly shuts back down? I have never encountered this type of problem with my desktop before!  I have checked all the power supplies and reset the powercord,  I unplugged the computer and tried to reboot it to no avail.  Does anyone know how to do the type of reboot where you hold down the power button and two keys (?) wait for the 2nd chime then let go of the keys?  I believe that is how it's done. 

iMac, Mac OS X (10.7.1), operating system- not 100% sure?

Posted on Jun 27, 2012 11:29 AM

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Q: my iMac turns on but won’t stay on

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