When I press on first white screen with lines, then white the black and it turns on again
Follow the steps at > If your Mac starts up to an Apple logo or progress bar - Apple Support
If that does not help, then you will need to schedule a service appointment at your local Apple Authorized Service Provider.
This forum section is for PowerPC iMacs made before 2006 and does not get a lot of views. Is yours that old?
In this user-to-user setting where we can neither see nor touch your tech gear, it is rather important to give details about you computer's sub-model (the bit with screen size and year), especially when asking about iMacs which have been in this earth since 1998. Details get you faster and more specific answers within the limitations of a forum setting.
Thanks!
Mac desktop not rebooting get white screen with lines
