Snow Leopard: I can't login when ethernet cable is plugged in.

I have a Aluminum 2007 iMac running Snow Leopard. When I try and boot it with all the cables plugged in (Keyboard, External Harddrive, Speakers, Ethernet, Second Display), it will bring up the login screen but then when I try and login, it will just hang at the default Snow Leopard Aurora Wallpaper. It shows the cursor but doesn't load the Finder or anything else. After leaving it be for a few mins, I restarted it a few times and it did the same thing. I have Archived and Installed a few times so far and that didn't fix it.
When I tried unplugging all the cables, it booted properly and works like a charm. When I plugged the Ethernet Cable in and booted it, it freezes like it used to. I tried plugging in other things and they work. But when the ethernet cable is plugged in at Startup, it will freeze at the default wallpaper (Located in System/Library/CoreServices/DefaultDesktop.jpg).
When I have the ethernet cable it will boot into Safe Boot.
Then when I booted it up without the ethernet cable it brought up two alert windows saying that Insecure Startup Item disabled. It says that /Library/StartupItems/tap and /Library/StartupItems/tun have can't be started because they don't have proper security settings. I looked them up and they appear to be Virtual Networking Interfaces (probably installed when I installed Parallels 4.0). Removing them and restarting with the ethernet cable in still has the same affect as before (freezing).
Anyone have any idea the ethernet cable is causing this to not login correctly.
Additional Information:
iMac
1TB HDD
3GB RAM

I suspect that it's busy trying to mount a network file system of some type.
Are there any errors in your logs that seem appropriate (viewable via Applications->Utilities->Console?)

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abi moore wrote:
{…} am on a test account which I setup before, when having problems. The login only goes so far, it stops at the blank background and the spinning wheel spins for ages, machine chuggs, and then that's it. It does nothing, no apps, no hard disc icon, nothing. Just the photo I have on the background.
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