unresponsive

Please help me, I'm going insane here. I installed Arch earlier, spent ages setting it up and pressed leave to check my lock screen after changing the sddm lockscreen, and it got stuck and became unresponsive. I shut it down holding the power button, turned it off and turned it back on...

Rather than reinvent the wheel, I'll post my issues link from the Mint forums. Really hoping to solve this asap as medical issues are also looming. Basically, everything went perfectly until launching firewall froze things. I didn't bother worrying and took the tower back to the owner where it...