One of the highly advertised features of the MacBook Pro was the MagSafe power adapter but it turns out that these adapters are plagued by lots of issues.
To resolve at least three issues with the adapter Apple is going to launch a redesigned MagSafe power adapter:
Of the potentially more serious problems are reports dating back to last year that the thinner of the two adapter cords has a tendency to heat up and fray near both the power brick and the MagSafe connector, creating a potentially serious hazard. As noted in a AppleInsider report from March, Apple has made at least one attempt to remedy this problem by increasing the strength of the plastic insulator where the cord meets the MagSafe connector.
Another, more recent issue is a tendency for the tiny pins inside the MagSafe connector to improperly spring back into place, resulting in a faulty connection between the MagSafe connector and the MacBook Pro's built-in power adapter port.
And lastly, some adapters -- including those owned by AppleInsider -- are showing signs of a somewhat benign defect where the LED indicator light on the MagSafe connecter will intermittently shut off even though the adapter continues to charge the MacBook Pro.