Problems Encountered with Internal Display After First-Time Firewire Connection

Hello Mac community. I hope you can help me with a problem I’m experiencing. Please bear with me as I navigate the forum. I acquired several Macs as a joke, all models from 2009 to 2011.

Recently, I started working with a 2011 21.5-inch model that has a display issue; the backlight isn’t functioning. To check for any image output, I purchased an HDMI adapter for Firewire. Given that the image output remained blank—meaning the monitor wouldn’t activate—I decided to test it on my larger 27-inch iMac from 2011. In hindsight, that was a mistake.

After turning off the 27-inch iMac, I found that restarting it required multiple plug-ins and plug-outs of the HDMI adapter before the system recognized the internal screen again. The internal display remains black, and it only activates after several attempts of manipulating the HDMI adapter. This situation is quite frustrating. For context, here’s what I’m working with:
– Mac Model: 2011 12.2
– Processor: i7 2600
– RAM: 32GB
– Graphics: 6970 1GB
– Storage: 2x 512GB SATA
– Operating System: macOS Ventura (via OpenCore)

I apologize if I posted in the wrong thread.

The 27-inch iMac used to start normally with its internal display. However, since my trial with the HDMI adapter, it only activates after this cumbersome process. Thank you for any help or guidance you can provide! Your assistance is greatly appreciated.

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