Arg! powerbook power issues

Ok, so, basically since I got it, my power adapter for my powerbook was weird, and when I inserted it, a lot of the time I would have to twist it around in order for the light showing it is giving power to light up. about 2 months ago, the adapter died entirely, and just wouldn't give power. So I called up apple, since I was still within the year since I bought the computer, and they sent me a replacement adapter, which worked quite well. Soon however, I had to twist this one to get it to light up, just like the last. But it still worked so I didn't mind. However, today it went really weird. The light is on the power adapter, saying it is charging, but the computer is losing power, and doesn't detect any charger! Luckily I have another charger that is for the car, but which also has and AC adapter, and that works. Is there anyything I can do to make my old power adapter work, or will I have to get ANOTHER replacement from Apple?! Thanks for any advice.