Power adapter intermittent charging

I have a late 2006 17" Mac Pro for which I recently replaced the power adapter. As recommended by Apple, I purchased the 85W MagSafe adapter with the "L" style connector. The original adapter had a "T" style connector.
About two weeks ago, the adapter began to function intermittently: sometimes it would charge the laptop and sometimes it would not. Whether or not it was charging was clearly indicated by the small light on the connector. I took the laptop and adapter to my local Apple Service Provider to explain the situation and, of course, it functioned perfectly while at the shop. The technician ran a diagnostic on the computer and adapter and confirmed that everything was working properly.
Nonetheless, the intermittent behavior continued. After a little troubleshooting on my own, I determined a pattern to this problem.  Here's what I found:
1. If the computer is plugged in before it is booted up, the adapter charges.
2. If the computer is running or asleep when the power adapter is plugged in, it does not charge.
3. If the computer is plugged in (and not charging), and is then shut down completely and turned back on, the power adapter will begin to charge as soon as it boots up.
4. If the computer is plugged in (and not charging) and restarted without shutting down completely, the adapter will not charge.
Any ideas on how to remedy this situation? Resetting the Power Management Unit maybe?
Thanks, Everyone!

First of all, stop using the adaptor--it is dangerous and appears to be unusable now. Take a look at this article:
http://support.apple.com/kb/TS1713
Also read the linked articles.
The argument that you will need to make to Apple is that the condition resulted from faulty manufacturing and not from user abuse. I think these situations are decided on a case by case basis. I think the earlier models also had a flimsier strain relief than the later ones, and these earlier ones were more prone to failure. If that's what you have, you may be able to make a case for replacement.
Good luck!

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