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Imac as clean windows pc?

koden

macrumors member
Original poster
Feb 13, 2016
58
5
I have this old Imac 27" late 2009.
Actually I have 2.

On one of them I would like to have windows and only windows.

I have tried a dual boot solution, but my windows partition seems to fail after some months.

is it possible to use a imac as a windows pc without any MAC OS installed?

When I google on this it seems not to be possible.
The reason is that a MAC uses EFI bios.

But maybe someone in here has tried :)
 
Last edited:

mmomega

macrumors demi-god
Dec 30, 2009
3,632
1,796
DFW, TX
I have this old Imac 27" late 2009.
Actually I have 2.

On one of them I would like to have windows and only windows.

I have tried a dual boot solution, but my windows partition seems to fail after some months.

is it possible to use a imac as a windows pc without any MAC OS installed?

When I google on this it seems not to be possible.
The reason is that a MAC uses EFI bios.

But maybe someone in here has tried :)

I have a late '09 27" i5 doing this exact thing, it had Win8 on it and now Win10. Get your Bootcamp drivers downloaded to USB drive, start the entire bootcamp process as you normally would except when you reboot into the Windows setup disk, delete all partitions down to one partition then format it to ntfs and let the setup disk continue.
You'll have nothing but Windows and a fresh install.

You can always re-add OS X later if needed through internet recovery but be prepared to lose the Windows partition in the process.

****
On the newer MAC without a Superdrive installed you can use a Windows USB install drive and skip the entire bootcamp process.
If you have a USB install drive just plug in the drive and press Option after the chime and boot directly to the USB drive and delete all partition and format to NTFS and go straight to Windows.
Be sure to have a Bootcamp USB drive handy for your particular computer if you want to skip using BootCamp to start the install.
 

koden

macrumors member
Original poster
Feb 13, 2016
58
5
I have a late '09 27" i5 doing this exact thing, it had Win8 on it and now Win10. Get your Bootcamp drivers downloaded to USB drive, start the entire bootcamp process as you normally would except when you reboot into the Windows setup disk, delete all partitions down to one partition then format it to ntfs and let the setup disk continue.
You'll have nothing but Windows and a fresh install.

You can always re-add OS X later if needed through internet recovery but be prepared to lose the Windows partition in the process.

****
On the newer MAC without a Superdrive installed you can use a Windows USB install drive and skip the entire bootcamp process.
If you have a USB install drive just plug in the drive and press Option after the chime and boot directly to the USB drive and delete all partition and format to NTFS and go straight to Windows.
Be sure to have a Bootcamp USB drive handy for your particular computer if you want to skip using BootCamp to start the install.
 

Fancuku

macrumors 65816
Oct 8, 2015
1,013
2,597
PA, USA
When I google on this it seems not to be possible.
The reason is that a MAC uses EFI bios.
Windows 7 and later can be installed in UEFI. You will be fine. You will need the Bootcamp drivers either before the install or after the install.
 

koden

macrumors member
Original poster
Feb 13, 2016
58
5
Nice nice... I will try that :)

Funny that I could not find any on google that have had succes with this.

Only lot of people sayng it is not possible
 

intz2nu

macrumors 6502
Oct 28, 2012
398
40
Awesome Thread given I was curious about the samething only with a late 2010 iMac.
[doublepost=1455451441][/doublepost]
I have a late '09 27" i5 doing this exact thing, it had Win8 on it and now Win10. Get your Bootcamp drivers downloaded to USB drive, start the entire bootcamp process as you normally would except when you reboot into the Windows setup disk, delete all partitions down to one partition then format it to ntfs and let the setup disk continue.
You'll have nothing but Windows and a fresh install.

You can always re-add OS X later if needed through internet recovery but be prepared to lose the Windows partition in the process.

****
On the newer MAC without a Superdrive installed you can use a Windows USB install drive and skip the entire bootcamp process.
If you have a USB install drive just plug in the drive and press Option after the chime and boot directly to the USB drive and delete all partition and format to NTFS and go straight to Windows.
Be sure to have a Bootcamp USB drive handy for your particular computer if you want to skip using BootCamp to start the install.

Thanks a whole lot for sharing this info with us, really very helpful indeed!
 

mmomega

macrumors demi-god
Dec 30, 2009
3,632
1,796
DFW, TX
Awesome Thread given I was curious about the samething only with a late 2010 iMac.
[doublepost=1455451441][/doublepost]

Thanks a whole lot for sharing this info with us, really very helpful indeed!
This worked on all of my Superdrive iMacs, I have a 2009, 2010 and 2011 and now a 2012(which doesn't come with a SD) strictly running Windows 10.
 

koden

macrumors member
Original poster
Feb 13, 2016
58
5
This worked on all of my Superdrive iMacs, I have a 2009, 2010 and 2011 and now a 2012(which doesn't come with a SD) strictly running Windows 10.

I have done like this.

diskutility:... 2 partions. My mac and a new one for windows Fat 32 (could only choose several mac partions and one fat).

Bootcamp: boot on my windows 7 CD
Deleted all and created 1 big partion on 1 TB.
Installed windows on this...

All was fine until I got the black screen...which I know from earlier when I had dual boot.

The problem should be atikmdag.sys which has to be deleted.

https://softwareandservice.wordpres...een-problem-right-after-installing-windows-7/

But since I have no MAC partion anymore how do I get into imac and delete this file?
have tried with windows CD and safe mode. But gives error.

Any idea...maybe some tool to boot up on like paragon in the link.
But it's a DMG file I get when I download.
Can I boot from that?
 
Last edited:

koden

macrumors member
Original poster
Feb 13, 2016
58
5
repair on win 7 cd and cmd prompt...working. but I don't have that file.. another problem then..
 
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