Restoring wiped out Mac mini late 2014

[kriskros]

Hi everyone.

I'm new here and this is my first post.
I have... problems and need help.

This is a story:
I bought Mac mini a couple months ago and I loved Mac mini but I didn't love OS X. I installed Win 10 Insider Preview using BootCamp. I ran OX X sometimes but less and less. Some day I desided to throw it away and I threw it away. During Win 10 market version install I also threw away all partitions including Recovery partition and EFI partition and changed GPT to MBR (Today I am very ashamed of this.).

What is the situation now?
- Windows is working pretty fine.
- There are problems with sound system - I can hear sound only via HDMI (when I connect TV). No sound on internal speaker. All other drivers are ok.
- None of startup key combinations works (I think because there is no Recovery partition.) and therefore internet recovery is impossible.
- When I plug in Windows instalation USB drive Mac mini doesn't boot at all - black screen.

My goal is to restore factory state of my Mac and remove OS X wisely and install Windows 10 wisely (but using this way rather than BootCamp).

What tools I have?
- Mac mini
- USB Drive
- Windows 10 laptop
- Internet connection
- screwdriver

I think I need Mac Mini late 2014 partition schemas and images, Windows tools such as diskpart, Partition Assistant and some your knowledge and experience.

Help please. Any thoughts?

Kris

PS.
Command-Option-R startup combination doesn't work - black screen.

Mac-mini late 2014: 2.6GHz Dual-Core Intel Core i5, 16GB, 256GB SSD

 

[Shirasaki]

After reading your post, I am shocked that Internet recovery is stored on disk, not on motherboard.

 

[DeltaMac]

Internet recovery does not need a local hard drive at all, although you would need a drive of some kind to make internet recovery useful, eh?
And, internet recovery is not physically stored anywhere local - it is simply supported by the hardware that you have in place.
Are you using a wired USB keyboard? Is it an Apple-brand keyboard?
Some generic Windows keyboards, wired or not, may not always support the Mac's keyboard boot commands - but at least a wired keyboard will be more likely to work than a wireless.

BTW, Internet Recovery connects to Apple's servers, and can take a significant amount of time.
It takes my mini nearly 5 minutes to complete the boot to Internet Recovery. It took nearly 60 seconds before any response beyond a black screen, when the rotating world symbol appears.
If you DON'T see the rotating world, but see the Apple icon, you haven't done it right.
Try a PRAM reset
At the second boot chime (while the chime is still sounding), press and hold the Option-Command-R
Wait - keep holding the keys until something appears on the screen.
Finally, internet restore (to download the OS X system) won't work unless you have an active internet connection, using DHCP, with no proxies. This article talks more about that.

When you boot to the Internet Recovery menu, you'll want to erase your hard drive, making sure that the partition is set up to be usable by OS X. You can use Disk Utility, which will be available to you when the internet boot completes. You'll need to change the partition before you can reinstall OS X.