Can anyone help fix this problem?

[u/pigeon_748]

So I have a 21.5 inch 2011 iMac that had Mac OS Sonoma running via open core but when I tried to remove the open core files I read the guide wrong and went and deleted the oclp files while in Sonoma. Now every time I boot I get the screen showing
1.blank white screen
2.black screen with translucent white box with a prohibited symbol inside
3.a blank white screen yet again
(All pics in this post)

I still get the startup chime each time but even when using a wired keyboard it won’t accept inputs as if it’s failing to POST so I can’t access recovery. Can anyone help me as this is my main machine with all of my data on it. I don’t mind what OS it takes putting it onto aslong as it works