MacBook magsafe (power) port doesn't look right

I'm coming to the realization that what I thought was a bad-power-adapter problem is actually something worse. About two months ago I replaced my previous power adapter (a MagSafe "T"-style) because I'd been having flakiness problems when trying to charge my MacBook (early 2008 13", model 4,1) -- it would sometimes refuse to recognize that the charger was plugged in (continuing to operate from battery while the indicator light on the end of the adapter stayed dark), and other times that indicator light would remain green, even with a mostly-drained battery, and the Battery Status in the menu would read "Battery Is Not Charging".
Anyway, I replaced the adapter and am starting to have the same problems -- and I've tried other adapters too, that I know work, with the problem still recurring.  So I looked at the other end of the matter: my MacBook's power port.  And aha!  I see something odd. Looking not at the pin-sockets themselves but the large rectangular area around it, I see some grey stuff which at first I think is accumulated crud, causing contact problems because it's covering up the metal surface.  But after a little poking at it I realized it's not coming off easily... and hey, is that surface *supposed* to be metal?  A couple of image searches on google seems to show it should be grey colored, so maybe in fact that "crud" is actually all that's left of a partly worn-away coating! Maybe my problem is actually that that exposed metal is causing some kind of grounding problem?
So I'm not sure what's going on.  Should I in fact get that grey stuff out of there? Should I leave it, and find a way to cover up the rest of the metal, like with electricians' tape?  Any advice is eagerly appreciated!
Edited to add the photo I forgot the first time:
Message was edited by: jimmosk

Hi minimidgy,
welcome to macbook forum.
open your system preference > display and check if your resolution is the same as your brothers macbook, it goes also with the color depth (thousand or million) and refresh rate.
You can click on Color tab and choose the same display profile as other macbook, or you can calibrate your lcd to match it by click on calibrate button and follow the instruction there.
Good Luck.

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