Restarting

Im well aware of the switch issue, i meant to post this in the thread versus making a new one. My game keeps restarting telling me i have a issue with my hard drive and i can't progress past a mission.

You HAVE to do several mission with Trevor before you can switch back to the others. I think I got (POSSIBLE SPOILER)

Trevor to Los Santos before I could use all three again.

G'day,

Do you quit the previous game you were playing by bringing up the Guide, scrolling down to the game you were playing, press the little button on right and choose quit, before starting to play a different game?

This allows all resourses available to load the next game unimpeded.

There is an option to reset all game data somewhere in the options.

Almost everything carries over. Any blueprints you've found, any weapons and clothing you have in your lockers, your stats such as number of zombies killed - number of frank statues found - number of tragic endings found, any vehicles you have in your garages
etc.

.

The only things that don't carry over are safehouses that you've cleared (you'll have to clear them again) and of course story progress and side missions. Those of course reset.

.

There's no special option to restart, you just need to start a new game and all of your stuff is still with you. Everything transfers between story mode and nightmare mode - it's all one big save file.

.

In fact as long as you've finished the game on nightmare mode, you can choose to switch to story or nightmare mode at any time and at any chapter you wish, from the chapter select menu - and you still keep everything.