[McDaygo]

Originally Posted by hollywood21639

It's due to your new console, the arcade downloads you purchased are tied to you gamertag AND the console you bought them on. Since you don't have your original console anymore your downloads are only playable when signed into Live. Your brother's downloads would be available when he's signed into Live as well.

It's a security thing

I believe this is correct, the only people that may help is XBL cust service but I think they can't do too much.