Disconnecting display knocks Mac off network

After the latest Tiger update (10.4.4) my PM G5 disconnects from the network (AirPort Extreme card connecting to a Linksys 802.11g router) when I unplug the monitor.
I use a PowerBook for work, and when working from home I disconnect the display, FireWire, and USB cables from the G5 and plug them into the PB. Then I use OSXVNC+Chicken of the VNC to control the "headless" G5 from the PB. This has worked well in the past.
Now, when the display cable is removed from the G5, it disconnects from the network completely. No VNC, no file sharing, it doesn't even show up under Bonjour.
Did something change in a recent Tiger update to make this happen? If so, how can I undo this "enhancement"?
Thanks for any ideas.
PM G5   Mac OS X (10.4.4)   Cinema 23"

Not that ayone has shown interest in this problem, but I solved it by turning the Firewall off. Perhaps not a great security plan, but at least it allowed me to get my headless G5 back on the network. I would have done something more refined like open only certain ports, but the problem was that the computer removed itself completely from the network--it didn't just lock down certain ports.
Anyway, that's what fixed my problem.
PM G5   Mac OS X (10.4.4)   Cinema 23"

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    Every time I turn my mac off, the desktop background changes. It always returns to the same picture, which was the second or third thing I changed my desktop to after getting my mac. I have background switching unchecked in my preferences, and I have never selected it as an option. Also, when I go to my preferences, it will show the icon of the picture I changed it to, even though the desktop itself has switched back.

    I would start with some basic troubleshooting.
    REPAIRING DISK PERMISSIONS -
    NOTE: refer to article "About Disk Utility's Repair Disk Permissions feature" found here http://support.apple.com/kb/ht1452 - for the actual apple article on these step. ----
    - click finder in the bottom dock, and in the window that opens, select applications in the left column - scroll through until you see the 'Utilities' folder and double click to open it.  Then double click on 'Disk Utility'
    - When prompted to select a disk volume or image, select the 'Macintosh HD' in the left column
    - ensure the the "first aid" tab is highlighted blue in the middle of the screen
    - click the button at the bottom that says 'Repair Disk Permissions'
    - this process will take a few minutes to run.  It will indicate it's done, by scrolling to the bottom of the "details area" displaying 'Permissions repair complete'
    Dan Frankes has written an excellent article for Macworld on "Permissions" and the need to repair them - see - http://www.macworld.com/article/52220/2006/08/repairpermissions.html.    Another good web site is - http://www.thexlab.com/faqs/durepairfns.html.
    REPAIRING DISK - About OS X Recovery - http://support.apple.com/kb/HT4718.
    - restart your computer hold down command + R keys on the keyboard to boot you into Lion / Mountain Lion Recovery mode
    - select english as your main language then the continue arrow
    - select "Disk Utility" on the resulting screen then 'Disk Utility' ---
    - When prompted to select a disk volume or image, select the 'Macintosh HD' in the left column
    - ensure the the "first aid" tab is highlighted blue in the middle of the screen
    - click the button at the bottom that says 'REPAIR DISK' .......NOT "Repair disk permissions"
    - this process will take a few minutes to run.  It will indicate it's done, by scrolling to the bottom of the "details area" displaying "The Macintosh HD appears OK"
    If you get any other message OTHER than "The Macintosh HD appears OK", like "the Macintosh HD was repaired successfully" run the "Disk Repair" again, until it displays  "The Macintosh HD appears OK".
    Once done, restart the computer as normal

  • Display Problem: Mac Mini no longer shows up on my Hitachi TV

    Everything had worked just fine for a couple of months and then I started importing a bunch of my CDs. During this process, I did something that made the desktop image from the mac mini larger than that of the TV (So I couldnt see the upper menu and the lower one was partly cut off.
    To try to fix it, I went into the display preferences menu and chose a different resolution (I think was something X something interlaced). When I did that, the screen faded black and I couldnt see anything. For a while, I could see the initial load screen for the mini, but the desktop would never show up and my TV would just say No Sync. Signal.
    Any thoughts? Thanks a ton for your help.

    hermanherman, welcome to Apple Discussions. Generally when this type of issue crops up it can be corrected by starting up in Safe Mode. To start the mini in Safe Mode, after pressing the mini's power button, immediately press and hold down the Shift key on the keyboard until you see a message on the display that Mac OS is starting in Safe Mode. When you see that message you can let go of the Shift key. Hopefully you will have a useable screen at that point. Go into Displays preferences and select your desired resolution. Then restart the mini normally (don't hold Shift) and hopefully your last resolution setting will persist and you will have your screen back.
    By the way, what you were looking for in the first place is an "Overscan" check box within Displays preferences. This controls whether the edges of the Mac desktop will be beyond the borders of the screen or not. Good luck.

  • I cannot keep "no proxy" checked. It keeps changing to another option and knocking me off line.

    I check "no proxy" and then "ok" but it keeps changing back to "use networks proxy" and knocks me off line. I have to have "no proxy" checked to use Fire Fox!
    Sincerely, kitty

    See:
    * http://kb.mozillazine.org/Preferences_not_saved

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