IMac don't start

Hi abimael288,

Welcome to the Apple Community.

Wondering which iMac model you have,

and'

which MacOS is installed on your iMac.

Apple support have an article online that may help:

If your Mac starts up to an Apple logo or progress bar - Apple Support

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Also, if you regain access:

How to: Identify your iMac model – Apple Support

How to Keep your Mac up-to-date – Apple Support

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If more help is needed:

You may want to reach out to the iMac Support Team

Eg: There is a "Get Support" link at the bottom of their webpage (link below)

iMac - Official Apple Support

Or

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

All the best :-)