iMac will not start up

Hi cthode2,

There are several things to try.

First, read these articles: If your Mac starts up to an Apple logo or progress bar - Apple Support and If your Mac doesn't turn on - Apple Support.

Let us know how the troubleshooting steps in the articles go.

Cheers,

Jack

If your computer will not start up after trying the items listed in the links above, please make an appointment at your local Apple Authorized Service Provider and take it in to be professionally diagnosed.If you don't know where an Apple Authorized Service Provider is please use the following link to find one in your general area.

Apple Authorized Service Provider Locator (AASP) & Genius Appointment

Best of luck!