I decided to whip out the Gameboy Color to play a few classics before I go to bed but something's wrong. It works fine if I put batteries in the back but I don't want to waste them, so I plug it in via the DC3V mains lead next to the headphone jack and turn it on, what do I get? I very lowd buzzing noise. But the game still plays fine on it anyway (with just the cable, not the batteries). But this is very odd since the cable has worked fine for me before. And the speakers work fine when I just use batteries. So I tried plugging headphones into the headphone jack and now the buzzing comes out of the headphones when the system in on. What's happening. Is it a problem with my gameboy color or the cable?