my imac does not start up after failed win7 install

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Level 1

18 points

my imac does not start up after failed win7 install

I tried to install Win7 on my MBP2010, (High Sierra, APFS); I have the disk, made a bootable .iso and all that.

Installing windows went on untill the installer said "need an NTFS partition", and evidently Bootcamp had partitioned the mac but somehow the format was wrong.

Checking all the red stop boxes in the pop-up windows. It said it would restart.

It did but it started to boot the windows installer again.

I ejected the disk, removed the external media (USB).

Now it still does not open MacOS - I get a black sreen and the remark:

"no bootable device -- insert boot disk and press any key"

So it seems the MBP is in limbo. Neither Macos nor Win.

How can I retart in Macos (pressing CMD/option does not help.)

iMac, macOS High Sierra (10.13.1)

Posted on Apr 17, 2018 6:42 AM

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Answer 1

alberti-nl Author

Level 1

18 points

Apr 18, 2018 11:48 PM in response to Loner T

Thanks a lot.

This solved it. The boot sound is heard

On Mac computers that play a startup sound, you can release the keys after the second startup sound.

and I held it about four times, but as soon as I let loose the mac screen with its logo started.

I will totally stop fiddling with win7 on this old 2010 machine (I also had trouble making the bootable iso disk with 'bootcamp' for this machine on it.)

I will install Win10 on my new iMac - maybe can do that with assistance, I'm in the first 90 days.

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Answer 2

Loner T

Level 9

59,471 points

Apr 17, 2018 7:35 PM in response to alberti-nl

Reboot the Mac and hold Alt/Option. If you cannot select macOS, then reset NVRAM - How to reset NVRAM or PRAM on your Mac - Apple Support - and try to boot into macOS.

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Answer 3

alberti-nl Author

Level 1

18 points

Apr 17, 2018 10:57 AM in response to alberti-nl

Just to give more details: restart and pressing down the command key does not have any effect.

It looks as if the ROM has been grabbed by the windows installer 😠

Any suggestions for another key sequence?

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Answer 4

alberti-nl Author

Level 1

18 points

Apr 19, 2018 7:00 AM in response to Loner T

I do have the DVD (but it is the OEM edition ..) and this did not work under HS.

I did have it running before on a 2010 iMac by the way so the DVD was at one time working. When I made the .CDR=.ISO file the key was accepted.

But i'll leave this project.

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Answer 5

Loner T

Level 9

59,471 points

Apr 19, 2018 2:29 PM in response to alberti-nl

alberti-nl wrote:

I do have the DVD (but it is the OEM edition ..) and this did not work under HS.

OEM Disks do not work, but you can directly download W7 ISO from Microsoft.

alberti-nl wrote:

I did have it running before on a 2010 iMac by the way so the DVD was at one time working. When I made the .CDR=.ISO file the key was accepted.

The DVD should still work, if it was burned correctly.

alberti-nl wrote:

But i'll leave this project.

Post back, if you decide to pursue this further.

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Answer 6

alberti-nl Author

Level 1

18 points

Apr 17, 2018 6:48 AM in response to alberti-nl

Just make it clear: after I force down the system now, and start it again I get a white screen that after some times goies into the black with the request for the bootdisk.

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Answer 7

alberti-nl Author

Level 1

18 points

Apr 17, 2018 7:09 AM in response to alberti-nl

I am now making a bootable HighSierra (downloading and will use Create`installMedia).

Hope it will start up . . .

Otherwise it is a very costly day.

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Answer 8

alberti-nl Author

Level 1

18 points

Apr 17, 2018 7:29 AM in response to alberti-nl

I attached the bootable High Sierra disk. Now got a blinking 'dash' - - - on a black screen.

and nothing else seems to happen. 😢 Need to start crying really.

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Answer 9

alberti-nl Author

Level 1

18 points

Apr 17, 2018 11:37 AM in response to alberti-nl

I have High Sierra last version 10.13.4 and the hard disk is a 500GB SSD EVO Samsung.

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Answer 10

Loner T

Level 9

59,471 points

Apr 19, 2018 5:19 AM in response to alberti-nl

On the 2010 Mac, you need to use a W7 DVD to install Windows. A bootable USB installer is not supported. I use a 2010 MBP with a built-in Optical drive and run W7.

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my imac does not start up after failed win7 install

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