Solved Missing Operating System message while booting

[adamf]

You have a bootable USB, next is looking into the flashing cursor. There are lots of threads about this but a good start seems to be go into bios, reset defaults and try turning AHCI on (or perhaps off).

Re-Installing Win7 / Process hangs in a black screen with cursor - Windows 7 Help Forums

 

[skiabox]

I believe that this is a problem with UEFI vs Legacy boot but I don't know how to handle it.

 

[adamf]

Nor do I - I've never installed UEFI. Hopefully some else will come along with a suggestion. You might want to open another thread called "Flashing cursor on clean install" though if no-one chips in as all the comments on this one might put them off.

In the PLIST though there is this section

<key>PreUEFIModels</key>
    <array>
        <string>MacBook7</string>
        <string>MacBookAir5</string>
        <string>MacBookPro10</string>
        <string>MacPro5</string>
        <string>Macmini6</string>
        <string>iMac13</string>
    </array>

I know that my MBP will not boot windows EFI (Mine is MacBookPro10). Depending if you Sony is UEFI (or not) you might want to add or remove your mac model number here so it makes either a EFI or Legacy USB (and then resign the application).

That really is only a guess though.

 

[skiabox]

Thank you so much for your help.
How do I know if my sony vaio is EFI or Legacy USB?

 

[adamf]

You'd need to look it up with the full specs

Looking into this https://tomstechnotes.wordpress.com/tag/boot-camp/ when compared to your YouTube video he changes the PreESDRequiredModels and PreEUFIModels as well as PreUSBSupportedModels.

If you update these other 2 it should (might anyway) make you a USB that will boot Legacy. As your last USB doesn't boot changing these 2 should make the other type. So whatever it has made if you make the other it might work even if you don't know which is required (if you see what I mean).

Worth a try unless someone has another idea... I don't know about UEFI I'm afraid - only what I've just read

 

[skiabox]

Pre means that the system is not using these settings at all?Because this guy is removing only the Pre- from PreUSBSupportedModels.

 

[adamf]

He is removing the Pre from PreUSBSuported models to make the box appear. For the PreUEFI and PreEXD he's adding his model. The way I read it is if you add your model to the PreUEFIModels you get a Legacy boot USB.

This is what I have (by default) for MacBookPro10,2 that creates Legacy USB (also Yosemite). I didn't need to change PreUSB as I already had that option. Note the syntax drops the ,2 from the model so it is MacBookPro10 not MacBookPro10,2

You can see my model is in the top 2 arrays but not in the bottom 2. If I add my model to PreUSBSupported I looses the ability to write to USB. If I leave it there and then remove the Pre suffix then writing to USB starts working again.

I'd leave your PreUSBSupported change as it is (because it works) and just add your model ID to the top 2 if it isn't already there and remove it if it is.

    <key>PreESDRequiredModels</key>
    <array>
        <string>MacBook7</string>
        <string>MacBookAir5</string>
        <string>[COLOR=#ff0000]MacBookPro10[/COLOR]</string>
        <string>MacPro5</string>
        <string>Macmini6</string>
        <string>iMac13</string>
    </array>
    <key>PreUEFIModels</key>
    <array>
        <string>MacBook7</string>
        <string>MacBookAir5</string>
        <string>[COLOR=#ff0000]MacBookPro10[/COLOR]</string>
        <string>MacPro5</string>
        <string>Macmini6</string>
        <string>iMac13</string>
    </array>
    <key>PreUSBBootSupportedModels</key>
    <array>
        <string>MacBook7,1</string>
        <string>MacBookAir3,2</string>
        <string>MacBookPro8,3</string>
        <string>MacPro5,1</string>
        <string>Macmini4,1</string>
        <string>iMac12,2</string>
    </array>
    <key>Win7OnlyModels</key>
    <array>
        <string>MacBook7,1</string>
        <string>MacBookAir3,2</string>
        <string>MacBookPro5,5</string>
        <string>MacPro2,1</string>
        <string>Macmini4,1</string>
        <string>iMac10,1</string>
    </array>

 

[skiabox]

I believe that we see it wrong.These are the settings I would put if I would like to run windows on my mac.
But I want to run windows on another laptop (sony vaio).
So I thought something clever.
I've downloaded Parallels 15-Trial which is full functional and now it downloads windows 10 tech preview.
Then I will install rufus in this virtual machine and I will try again.

 

[adamf]

That will be easier certainly. Use a USB2 stick if you've got one - I don't know about Parallels, perhaps it is OK, but Virtualbox has problems with USB3.0. Good luck.

 

[adamf]

Thank you so much for your help.
How do I know if my sony vaio is EFI or Legacy USB?

It looks like it is legacy and you want legacy set in bios windows 7 - Unable to boot from USB on Sony Vaio - Super User

 

[skiabox]

And yes ladies and gentlemen it works!

 

[skiabox]

By the way I am impressed about the quality of the Parallels software.

 

[adamf]

 

[skiabox]