If hacked lobbies and cheating wasn’t hurtful enough on Modern Warfare 1, players are now encountering a boot up error that will freeze up your console and make the game unplayable if signed in. That includes both the multiplayer and the single-player modes.
This is what many COD4 players are currently seeing upon boot up of the game. However, many people are claiming that there is a temporary fix, which you can find below.
Turn Console on
Unplug Ethernet Cord/ Turn off wireless
Go to Multiplayer and plug/turn back wireless on
Turn Console Off
Turn Router Off
Console On and go to network setting and re-establish connection to Router, so turn that back on.
The bad thing is you must do this every time you want to play COD.
Hopefully Infinity Ward fixes this, even if the game already has two other sequels; that is still no excuse to leave the game broken like this, especially if your unaware of the issue and just want to play some single-player.