Why does the iMac not boot sometimes.
My iMac started to have a problem booting it begins to boot where you hear the optical drive and Mac sound goes off. But then it stuck on a black screen where it's not responsive. If you wait maybe 10 to 20 mints it might turn. Most of the time if I unplug the back power cable and wait for the Mac to cool down than plug it in it starts normally. If I restart the computer it back to the same problems discussed earlier. Over all the Mac works well when it's on.
One more thing the Mac also sometimes when booting give me many white and black lines and dots moving all over the screen and the apple log with the curser near the right side of the screen loading instead of being in the middle. And if you put the Mac to sleep it turns on with a blue screen also not responsive
Does any one know what it might be
The system has 3gb ram running osx 10.9
Is this a good question?