I'm fairly new to OSX, and I'm having a problem I can't figure out. My internet has been disconnecting lately... it'll work for about 5 minutes, and then I will loose connection. This is now a router or ISP issue, technical support agents have verified all of my hardware and lines. Rather, it seems to be a problem with OSX. If I unplug, replug the ethernet cable, or change the network location, (basically anything that would cause the system to reapply network settings, as far as I can tell,) it will reconnect, but only for another few minutes. I've tried to use several fixes for this. Manual Ip's, automatic settings, using the mac assist prompts to create new network locations. Even switching to the Airport... all with the same result; I will connect for just a few minutes, and then loose connection again. I am running on the newest model (duo-core 2) intel 20-inch iMac. I have just recently updated to security update 2007 -004 and I believe this is at the root of my problems, as I had no problems whatsoever before that. Ive found out that several people have had issues with their wireless connections after the update, but I haven't come across another example of my problem. I am currently downloading the Mac OSX Combo 10.4.9 Combo installer to test if this update is the issue. I do not believe that this is a hardware issue, neither the ethernet, or Airport wireless connections will last longer than a few minutes... and both work after changing the settings. Is there something simple that I'm missing? I really hope so... I've never had this much trouble with the mac before this... Thanks!