Working with Snow Leopard 10.6. Purchased 1 year ago. Basically, I wish to prevent any network interface from being active and accessing the system in any form. I have not and will never connect to the internet or any form of any network with this machine. I have other computers for that. This Mac is to function purely as a kind of isolated writing device that should never be able to receive signals from any deviceApple or 3rd party. Despite having the airport card removed last Sep at an Apple store (genius bar), I'm still experiencing unusual behaviourthe same as before it was removed. For example, while writing on the lower part of the screen/page, a line of text is deleted higher up the screen. I can not stop this from happening with the trackpad or by using force quit. I have to wait for it to stop. The only way to retrieve deleted portion is to command z. This has happened in Text Edit and also writing software. I have installed only one new program--the writing software. Everything else is as is. This happened three separate times. Another time, writing I kept in text editor was deleted from a number of files when I came back to use the data. Sometimes my files are moved around the screen. Sometimes the cursor starts moving by itself and clicking on other parts of the page and I lose control of it during that time. I have Activity Monitor open but I can't see anything change during that time. Most recently, I was trying to delete the Bluetooth and Airport applications when I lost control and could not get the files into the rubbish. When I tried to delete them (changing preferences in Finder to secure deletewhich overrides the programs running), it would not let me, even though I've done this on earlier installs easily. Things I change in system preferences: Turned the Apple Firewall on. Refused all incoming connections. Disabled the Infrared Receiver Turned off all network connections. Removed blued/airport programs and all their components from core services. Removed any ip6, vpn, ppoe etc files. Removed a lot of other files relating to network activity. Despite that, I still get the same behaviour as before removing the network card and these files. I've tried installing the OSX several times. I do nothing and work and see what happens and get the same as when removing components. Either way, still the same losing control of the system. I don't run itunes, no movies, no music, nothing. Just writing. Activity Monitor sometimes shows new processes starting and stopping while I'm writing--I leave it open to see. Sometimes I click on the process with Quck Look but it quits before I get to examine it. This has happened several times. It really is bothering me now as, technically, it should not be accessible. I did a fresh install of OSX yesterday and opened system preferences, network, immediately, and got the message that it was identifying a new Firewire interface, the system froze, then everything went back to normal and no device showed up. Is it possible that a 3rd party device can be interacting with the system? If so, how would I identify it and prevent it from working. Where are the devices located? The only time I did not have the computer in my possession was a few days when lending it to a colleague last year. What kind of interface might enable this? How would I know? On the Activity Monitor, on a fresh install, after the removal of the cards, it shows the network as sending 1 kb packets every couple of minutes or so. When I blocked ntpd it showed error messages in the Console. I figured that was normal, but I don't know. I've been through all /usr/sbin etc folders and all /private folders, but I'm not technical enough to know what to remove other than the obvious network related files. I'm wondering if there is possibly a USB/phone chip inside or some other hardware addition? I installed Little Snitch today. I saw the usual ntpd-wrapper trying to send to an address. In the way you can completely block all incoming and outgoing interfaces? Or with something like Kaspersky's security software would do in Windows, and in the way it has an operating system firewall that shows application activity in a networked environmentis there a Mac equivalent? I want to completely shutdown access. I used Kaspersky in Windows to do this. Is there some way of doing this beyond the installed Mac software as it's not very effective. I observed that a lot of Mac users believe it's not necessary to worry about security beyond the pre-installed firewall, but I believe we're all entitled to privacy and I would like to ensure my work does not disappear, get deleted or get altered while I'm working on itespecially the parts I can't see. Because it's writing, it's important that it does not get changed. I don't have time to go back and check every word to see if it's been edited without my knowledge or, worse, deleted. I'm not technical at all, but it looks like there are a lot of security holes if you know what you're doing. I'm hoping someone with that knowledge might share how to shut them down, beyond the standard already attempted. Thank you very much.