Okay so I will make this as snappy as possible.
I was replacing the hdd on my imac and after completely reassebling everythin the way it was, I powered it back up and the light on the bottom right corner that is usually blinking slowly on and off is rapidly blinking maybe 3-4 times per second. Also, the display is powering up. I can hear the hdd spinning and the fans going but it seems like the screen is getting any power to it?

I checked the connections 2x already and it all seams fine? I am pretty lost and would appreciate anyone who has some background with this specefic model of computer.
I was replacing the hdd on my imac and after completely reassebling everythin the way it was, I powered it back up and the light on the bottom right corner that is usually blinking slowly on and off is rapidly blinking maybe 3-4 times per second. Also, the display is powering up. I can hear the hdd spinning and the fans going but it seems like the screen is getting any power to it?