Mac mini graphics output not working after unplugging

Hi,

I was recently given a mac mini late 2012 model and decided to install macOS Sequoia with opencore and it worked perfeclty until a few days ago. I had unplugged the power cable when I went away for a few days and now when I turn it on, it doesn't output any graphics to the screen. It makes a sound on start up but no output through HDMI or thunderbolt. I've tried NVRAM reset and SMC reset and nothing helps.

Would be grateful for any suggestions

submitted by /u/Inside-Hurry-9099
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