schoolhours

then what should i do??? Re-install it???

problem is for me that i cant login at all even on the vanilla... when i try logging in on any of them it says the exact same thing every time. iv tried updating my java,graphics,video,audio cards and even tried disabling the firewall on BOTH the computer AND the router. and nothing works and i tried it on my friends computer and it works just fine and he has the same stuff i have (graphics,video,audio,java,and firewall)

I am having the exact same issue with mine... i get the "cannot authenticate with minecraft.net" every time and nothing works i havent been able to play ever since i downloaded it 4 days ago and nothing is working. only once did i get it to play but then i got a blank screen. that was the best result i got. but now i cant do anything once again. please help. P.S. i did check the firewall and i disabled botht he router and my comp firewall and it still dosent work. Please help.