Since it's one of the original gaming systems, I would take it to a video game store and see if they can repair it!
A common problem with the Dreamcast is that it will keep resetting.
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Dreamcast BIOS dumps are not legally redistributable. You must dump them yourself from your own Dreamcast.
You only play Dreamcast games like Sonic Adventure on your Sega Dreamcast instead of Sega Saturn.
it is unlikely since the dreamcast and ps2 were "fighting" each other
no it cant the reason is wii is stronger and sega dreamcast is from sega and wii is for nintendo. gamecube games could be played on wii but never dreamcast.
Unfortunately no. The Dreamcast became obsolete before Sonic Heroes came out.