IMac shut down and will not turn on no matter what I try...help!

I am hoping that someone can help me. I have a 20", 2.0GHz Intel Core 2 Duo iMac that was purchased late 2007. A few days ago, it shut down on it's own during normal computer use and it won't turn back on since.
I have searched through the boards and most people recommend resetting the SMC, SMU and pulling out/placing back in the memory. I have tried all of those as well as using a brand new power cord but none have worked. I have also seen recommendations to reset the PRAM but since the computer has to be on to do that, unfortunately, I can't try it.
Has anyone else had this issue? Does anyone have any suggestions? Any help will be greatly appreciated!
Thank you in advance!

Hi and welcome.....
I have also seen recommendations to reset the PRAM but since the computer has to be on to do that
Not sure where you found that information but that is not the case. The Mac must be shut down in order to reset the PRAM. Follow the instructions here...
Resetting your Mac's PRAM and NVRAM
If resetting the PRAM didn't help, try here...
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Carolyn

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