Powersupply intermittently faulty
I have a Macbook Air purchased early 2013. It works well and is still happy, but the power supply has become a little flaky.
About half the time I plug the magsafe in, the powersupply does not charge the Air. Which is to say, the amber or green light does not light, and the battery indicator says not charging. I can 'fix' this by wiggling the plug a few times, and it always, eventually, goes to work, but the frequency of recurrence is increasing. This is a concern.
Any advice?
Is it the power supply? Is there an obvious fix (tighten screw A), or is a new power supply a good idea?
Any advice welcomed.
MacBook Air, OS X Mavericks (10.9)