My Dreamcast, which I’ve had for about two years now, no longer outputs anything to the display. No sound or video. It also doesn’t read discs, no spinning at all, almost like it isn’t booting. The VMU in the controller turns on, but it remains on a blank screen. I took it to my local games store, and they said that the AV port is the issue, and “we can’t fix it.” Is it possible that it is the AV port? Or something else?