Adding to bullzi's comment, you need to check the EULA on that thing. Apple (at least these days) includes a "You can't put other software on our stuff" clause and with the recent pack of retards (congress) voting that changing anything in a technological devices setup is now terrorist hacking... you may want to do a little investigative research into your actions before carrying them out.
If I were to try something like this as an experiment I'd imagine I'd have the below experience.
First, how old is this iMac? If it's old enough to be Apple manufactured parts, forget it... you will never find drivers.
Second, I would need to find a disc and a key. found it on eBay
for about $60.
Now I need to install this on an iMac. Being a Windows junkie, I wouldn't even know where to start with their BIOS to boot from a CD. I'm sure that's an easy answer for an Apple user, but I don't have that answer.
Now drivers.... You need to find the parts' make and model inside that thing and make sure you have drivers.
This is completely speculative but it may point you in the right direction. Good luck
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?