My iMac will no longer boot after half installing Maverick (only the essentials package was opened). How can I reboot it back to 10.8.5?

I was able to get a copy of OS X 10.9, but it wasn't the one straight from the App Store (which is free and I wish I knew before I got this other copy, but oh well). There is nothing wrong with the copy, it just simply doesn't initiate the install when you double click on it.
I installed one of the packages (essentials) off file, but not all the rest of them. For some reason the other packages weren't opening because it wasn't accepting my password, so I restarted the computer to see if that would make anything better.
It didn't. It now boots to the grey apple screen and stays stuck loading. I assume because only some of the install disk was installed, it doesn't really know what to do. But how do I fix this? How do I unistall the essentials package so that it goes back to normal?
I tried booting it whilst holding down "Command+Option+P+R" and it takes me to a limbo area where you can access disk utility. Within disk utility I can see that everything is still there.
What is the process to get it back to normal (I previously had 10.8.5).
Please help!

Thanks for checking in, BDAQua.
Problem solved.
In the docs that came with my Powerlogix accelerator card, I found this sentence buried:
"If you reset the PRAM, the NVRAM code for OS9 compatibility is cleared, so you will have to boot from the Firmawre Update CD and perform this process again in order to boot in OS9."
The "process" it's referring to is the process of setting up the NVRAM for booting into OS9 from the CD.
Fortunately, I was able to find the disk, and it worked as expected. I can now, once again boot into OS9.
Conclusion: My (unadvised) attempt to load Leopard on this old machine apparently reset the PRAM on the accelerator card and cleared the NVRAM code for OS9 boot. Although I did attempt to reset the NVRAM via Open Firmware, it did not reset it on the accelerator card.
So, thank you BDAQua, for your "Ah yes" . . . that's all I needed to steer me in the right direction.
Gratefully,
tupester

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