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hr3nk Author

Level 1

12 points

Black screen after PRAM reset

So, the problem started when the hard drive broke. I replaced it with old SSD previously used in my other Windows computer. I did not format it so when booting iMac it automatically started configuring Windows 10. That was strange, I shut it down and booted from BIOS, but the system couldn’t find my flash drive with Mac OS image on it (which obviously was there). I didn’t know what the problem was about, so I let the Windows load up, it worked fine. After that I read on some forum that if having a problem of “iMac doesn’t see flash drive with OS image” I should try resetting PRAM with cmd+Option+P+R shortcut, which resulted with expected reload, however after booting up the screen is totally black. There’s Mac sound of booting, there’s keyboard lighting, however the screen is totally black. I tried cmd+R but it didn’t work. Any ideas how to possibly fix this issue?

iMac Pro

Posted on Dec 6, 2021 7:14 AM

Top-ranking reply

SeaPapp

Level 7

26,492 points

Posted on Dec 7, 2021 2:51 AM

Would be helpful to know exactly which iMac and which version of the OS you're attempting to install. In the meantime, with your usb plugged in, you could try booting while holding the option key in order to access the boot manager screen.

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Black screen after PRAM reset

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