I have an iMac where I can connect to the internet within 10-15 seconds of turning on airport or plugging in cat-5 wire to use the ethernet connection. After this time frame I must turn airport off and then on to regain the connection. Or, if hard wired, I must remove the cat-5 and plug it back in. I have seen many posts similar to this on forums. However, all of the posts pertain to a wireless connection only. I have tried most all of the solutions people have offered including zapping my PRAM. Unfortunately, I have had no luck with any of them. Three things to note: 1. I believe this problem occurred after a power loss at my home. No power surge - just lost power. I can't be certain on the timing but thought this should be mentioned. 2. I have upgraded from 10.5 to 10.6 to try to rectify the issue - didn't work. 3. I have switched from comcast to AT&T - different router/different connection/different network preference - and nothing changed. So, the problem is not with the connection itself as I am able to connect for a few seconds. It doesn't pertain to the OS as I have upgraded and still no fix. Thanks in advance for your help.