Ok so the other day i updated minecraft to the newest update (the one with redstone blocks) now i cant get my minecraft open. i have no mods. i dont know what to do. i can log in but i cant get past the mojang page. it turns to the dirt blocks screen and crashes. i have an old macbook and im wondering if thats the problem. is there any way to fix this? i really would like to see the update.
Search the forums for instructions on how to downgrade to 1.4.7. I think there are a few posts in the "Recent Updates" and "Discussion" forums.