iMac screen distorted with vertical bars

The display is distorted with vertical bars, then turns to a white, blank screen, so it can not be started.

Tried Safe Mode; Disk utility (first aid) and reset the NVRAM all to nothing does not.

Any other suggestions would be appreciated.  Thank you.

The same display abnormalities occur after the Safe Mode boot?

You can run The Apple Hardware Test / Diagnosis of Apple , but each of its possible results will lead to the same result:

  • identify a defective hardware that only Apple will be able to fix,
  • "no problem found" despite the fact that something is obviously wrong.
  • or an inability to run diagnostic tests due to the problem that you are experiencing.

In any case, you've done everything you can do, and you will need to have your Mac evaluated by Apple for repair: Contact - official Apple Support.

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