Macbook won't charge or run off mains for more than a few seconds

Last week my Macbook power adapter seemed to fail - the light had disappeared and my battery slowly ran out of power. I tried using a different power cable into the adapter to see if the fuse had gone, but this made no difference. After trying several plugs and trying to use it with the battery removed, I decided to purchase a new adapter.
This worked instantly - the light came on and my Macbook was no longer dead. However, this only lasted for a few seconds or minutes, when the light on the Magsafe plug went out and the Macbook powered off again.
After trying several things I realised that the problem wasn't really with the adapter - it seems to be with the Macbook itself. If I disconnect the power cable from the adapter and reconnect, the light comes on and it charges again. This happens when the battery is in the Macbook, but also when there is no battery and I run just from the adapter. I can run the laptop pretty much indefinitely as long as I'm happy with 0-10% power in the battery and continually disconnecting and reconnecting the adapter, literally every 30 seconds or so!
Any ideas whether this is likely to be the logic board or just the power connector inside the laptop? I've tried resetting the SMC already (by disconnecting battery and adapter then holding down the power button for 5 seconds) but that has zero effect..

I too have problems charging. The macbook and macbook pro adapters seem flawed; if one looks into the problem on any of the many forums, you can see that this problem is widespread. The dang adapter works intermittently. There seems to be no rhyme or reason behind when it 'decides to work or not,' I think it is somewhere in the vicinity of 65% off and approximately, 35% on; in other words, it works properly only about one out of three times. When I first got the macbook it might have been a bit better but this problem of intermittent charging might be getting worse. All I know is several times lately, I have had to wait until randomly retrying it got it to function and by then my battery will have exhausted down to below 10%. Has anyone discovered any tricks which help kick this adapter in? I have heard rumors of a recall but that is all it is, I believe . . .

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ummm seems odd to have 100 users making a report.. that can be the limitation of your application..

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