Imac 21inch 2010 on boot vertical green lines then white screen ,will not load can anyone help please

imac 21inch 2010 on boot vertical green lines then white screen ,will not load can anyone help please

Howdy carliosa,
If your iMac is not starting up normally you may need to do some checking to make sure things are working correctly. I would suggest starting with the steps in this article -
Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support
Thanks for using Apple Support Communities.
Best,
Brett L 

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