My iMac will not not boot from or to ANYTHING
I have been scouring the internet trying to find any information on my issue, but I am at a loss. My iMac turns on normally, I hear the chime, starts to load the progress bar, gets near the end, and then the screen just goes blank white. It does this trying to boot from DVD, countless USB installers, Internet Recovery, and other HDDs that I have tried installing. I have tested with multiple known working RAM chips with no change. The thing will just not boot up from anything. I would appreciate any help and I will try any advice in a timely fashion and let you know the results. Thank you.