>>11
There's a very common and easy fix for that. I posted this on /v/ years ago with the exact problem and someone linked me to a site which I don't have anymore but.
The basic idea is you need to open up your dreamcast so you can see the insides you'll need to take the screws out and look for something near the front labeled the "F1 fuse". Now, using a pair of chopsticks or something similar you need to make the fuse touch itself by squeezing it together or if it's touching itself separate the fuse a little bit. You can probably find more information by googling dreamcast controller F1 fuse or something. An easy way to prevent this is after you've fixed it keep a controller ALWAYS plugged into port 1