I was trying to connect my Mini to my HDTV, and I had no luck. I used displayconfigX to overwrite OS X's display settings, and rebooted. Now it's stuck at a resolution that neither my monitor or TV can display. I've tried resetting the PRAM, no luck. I tried logging in Single user mode. I went to /Library/Preferences and rm com.apple.loginwindow.plist, it asked to overwrite, I said y, and it said something about it was read-only. So I don't know if it changed it or not, whatever it did (or didn't) do, it didn't work. I'm running OS X 10.4.10, but I don't have an install DVD here, it's from a Family Pack and my parents keep the discs as their home. What other options do I have? Please help as soon as possible! Thank you so much for any help.