why is my dc games in french

i bought a dc on ebay, it says ntsc u, but any game that has the option automaticly goes to french. why is this and is there a way to make goto english as the default language. if you do not understand my prob. here is an example. i put in worms world party and it uses the french language not english like it does in my friends, i change the language settings to us englidh and save but when i turn it off and back on it is in french again, soul caliber is in french too. please help if you can

[manii]

Most likely your backup battery from your DC is not charging and every time you turn on the system it will reset to factory reset. Next time ##### the time on the dc and see if resets to 00:00. In order to recharge your battery, you must turn the Dreamcast on without any games just a controller and leave it for about 24hrs. (I recomend at least 2 days or more) The battery will loose power if the DC was not use for a long time. This is normal.
Try it and I hope this works!