OS X is already installed even if it is not true.

[xRhino06]

I'm trying to install macOS El Capitan but the installer tells me that OS X is already installed even though that's not true.
How can I solve it?

 

[Feartech]

I'm trying to install macOS El Capitan but the installer tells me that OS X is already installed even though that's not true.
How can I solve it?

initial support for your Comet Lake is High Sierra

also before trying to install, at the recovery menu, open DiskUtility and then choose view -> show all devices

then click the actual drive and choose erase, then close it and try and install

 

[xRhino06]

initial support for your Comet Lake is High Sierra

also before trying to install, at the recovery menu, open DiskUtility and then choose view -> show all devices

then click the actual drive and choose erase, then close it and try and install

When I attempted the installation I had created the OS X Extended (Journaled) partition and called it Macintosh HD.
I specify that the HDD is connected via an internal SATA 6 Gbps cable.
Do I have to format the entire HDD?
So is this problem due to the fact that El Capitan is not supported by my CPU?

 

[Feartech]

When I attempted the installation I had created the OS X Extended (Journaled) partition and called it Macintosh HD.
I specify that the HDD is connected via an internal SATA 6 Gbps cable.
Do I have to format the entire HDD?
So is this problem due to the fact that El Capitan is not supported by my CPU?

yes, erase the entire drive

 

[xRhino06]

yes, erase the entire drive

I prefer to try High Sierra first.

 

[Feartech]

I prefer to try High Sierra first.

then how come you posted in El Capitan forum?

 

[xRhino06]

then how come you posted in El Capitan forum?

Because I thought it could be solved without formatting the entire HDD.

 

[xRhino06]

High Sierra doesn't give me this problem