Dreamcast (hardware)

In-game reset:
Press B + Y + X + A + Start during most games to reset the system.
Information in this section was contributed by CLDLJD2 and MaliciteJO.

Delete internal memory settings:
Alternatively, hold B + X on controller B and turn on the Dreamcast. Release the buttons after the date/time prompt appears. Note: This will not affect your VMU memory and will only reset internal information, such as date, time, and Dreamcast Network settings.
Information in this section was contributed by cobra13402.

CD-R discs:
You can play CD-R as well as other games from other regions on the Dreamcast without a modification chip.
Information in this section was contributed by john silva-koenig.

Alternate settings screen:
Have a saved game from Puyo Puyo Fever to place characters from that game in the background graphics of the settings screen.

Japanese disc art:
To view the original Japanese disk art, start your Dreamcast with the disc lid open. Put it in to the CD player mode, then put in a Dreamcast game that was originally released in Japan and wait for it to load. Instead of the red and white disc, the disc will be the Japanese disk cover. Note: This works on most but not all games (for example, Shenmue and Marvel vs. Capcom 2).
Information in this section was contributed by sanek.

Use your own music in games:
Buy an AV plug with a speaker link at the end. Take out one of the audio cords on your console that connects to the VCR or monitor. Plug in one of the AV cords into your VCR. Connect the end of the AV link to a portable CD player into the headphone jack with your music of choice, while making sure that the console still connects to the VCR in the same place. Turn on the Portable CD player. Turn on the video game console. Start a game, and turn the sound effects volume up while turning the music volume all the way down. Note: Some games do not have this sound option. Pick a track and play it on your portable CD player. In the game, you should hear the sound effects perfectly while the CD player's music is being played. Note: You can use tape players and radios in place of the CD player if they have headphone jacks.
Information in this section was contributed by Logan Peter McDonnell.

Trouble-Shooting -- if this does not work:

Check if the CD player and console are both plugged in.
Check if the CD player or console is on.
Check if you can turn down the in-game music volume.
Check the reasons in your console's manual why it is not working.
Check the reasons in your CD player pamphlet why the CD is not working.
Check to see if either of the CD's are scratched.