Late 2006 iMac without OS: How do I boot to reinstall? I was given a late 2006 iMac with the hard drives erased and no OS loaded. The iMac boots to flashing folder. I purchased a Mac OS Tiger Install DVD but it is not bootable. I also have a Mac OS Leopard Drop-in DVD that will boot to the installation menu but will not install because 10.4 is not found on the HD.

I have a MacBook Pro with Yosemite loaded and purchased a Thunderbolt to Firewire adapter and Firewire 800 to 400 cable to connect to the iMac. I put the iMac in Target Disk Mode and partitioned the HD into two partitions and copied the Mac OS Tiger install DVD to partition 1. On the MBP in Finder I can see on the iMac the Tiger install DVD loaded onto the partition 1 but in Finder the Install Mac OS has a slash through it. When I double click the Install Mac OS icon I get a pop-up when on the MBP saying Power PC Applications are not supported so I cannot run the Install MAC OS.

Is there some other way to get Mac OS Tiger installed on the iMac since the MBP cannot run the Install Mac OS on the iMac?
If you Tiger DVD is not bootable it might as well be PowerPC one.

If your iMac is Late 2006 it will support Mac OS X 10.7 as latest.
You can buy it from Apple for 20$. System requirements for OS X 10.7 is at least 2GB RAM though. So you might check first if you have enough. These are guides on how to get to the memory.

Then you will need USB pen drive and Lion Disk Maker to make it bootable out of bought file.

The mac will accept 2 or 3GB of DDR2-667 SODIMM RAM total(depending on exact model).