Clean install of Mac OS Sierra on iMac Mac Os 10.5.8

[Vasilis.Tops]

How can i do clean install of Mac Os Sierra with usb drive on iMac with Mac Os X 10.5.8?

 

[Raz0rEdge]

Power up your iMac with the OPTION button held and it should show the USB as a bootable device assuming it was made properly, you should then be dropped into a place where you can format your HD and begin the installation..

 

[MacInWin]

Welcome to the forum.

Which version iMac? That version of the OS is pretty old, and if the iMac is that old, it may not support Sierra. Click on the  in the upper left, then About this Mac and let us know what it says is the kind of iMac you have.

Here is Apple's page on the minimum requirements: https://support.apple.com/kb/SP742?locale=en_US

 

[Vasilis.Tops]

Leopard Mac Os X 10.5.8 / 2.93 Ghz intel core 2 Duo / 8 Gb 1067 MHz DDR3
It's very old! What should i do to perform a clean installation?

 

[Vasilis.Tops]

Leopard Mac Os X 10.5.8 / 2.93 Ghz intel core 2 Duo / 8 Gb 1067 MHz DDR3
It's very old! What should i do to perform a clean installation?

 

[Raz0rEdge]

Read Post #2.

 

[Vasilis.Tops]

it doesn't allow me to install from the USB. When i select the drive it looks like "not supported file"

 

[Raz0rEdge]

How did you create the USB installer?

 

[Vasilis.Tops]

Ι take the sierra installer from a mackbook and i follow the instructions to make the bootable usb drive from the link below :
http://osxdaily.com/2016/09/23/create-boot-macos-sierra-installer

 

[MacInWin]

Can you post what you got when you did what I said to do in Post #3? The oldest iMac that can support Sierra is the Late-2009, but your processor was not listed at that speed for the Late-2009 version, just the Early-2009, which is not supported for Sierra. Save yourself some trouble and first check to see if Sierra will even run on that machine.

 

[harryb2448]

More info needed about the precise model number. There are two 2.93GHz models, a 2009 which will only run up to El Capitan, and a 2010 i7 model which will handle Sierra. Boy upgrading from Leopard? Many of your applications may not work they are that old.

 

[MacInWin]

Harry, he said it's a core 2 duo, not an I7. But I agree, we need to know EXACTLY the model. It's close to the boundary of what can support Sierra.