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how to install MAC OSX on a MAC that has windows installed

I have a user that reformatted their mac pro. They installed win 10.  Now they want the MAC installed again.
Every option I press to get to the boot menu is not working.  
I'm trying to figure out how to install MAC OSX again on the MAC.  Any ideas?
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afacts
Asked:
afacts
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2 Solutions
 
Tyler BrooksNetwork and Security ConsultantCommented:
You should just need to hold option-command-r as soon as you hit the power button and that should take you to the recovery menu. Which will present you with the options needed to reinstall OSX.
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afactsAuthor Commented:
I get an error message, black screen with a globe and an exclamation mark in the middle.
The only writing:  apple.com/support  -2105F

Never seen these before.
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serialbandCommented:
Are you connected to the internet?  Recovery mode needs to contact Apple's servers to download the system and recover.

Does it have a superdrive?  If it does, how old is it?  If it's old enough to come with installer discs, you'll need to find those disks to install.  You can't use command option r to install over the internet in that case.
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afactsAuthor Commented:
We figured it out, so we needed to push ALT on the windows keyboard, since it's a physical MAC, but was running windows, it needed the MAC command on the windows keyboard.
Then that allowed us to install the OS again.
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afactsAuthor Commented:
Thanks guys for your input.
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