Minecraft sensitivity is weird?

I'm playing minecraft on pc and when I move my mouse up or down the sensitivity is lower. How do I fix this?

It has nothing to do with lagg btw

How to fire dispensers in minecraft?

I have a lot of dispencers which i filled with arrows but i don't know how to fire them.

A computer i can buy that is around 450 pounds? It has to be a gaming computer?

The computer should be able to run games like minecraft, feed the beast and also high end games such as battlefield 4 at a high fps on high settings aswell as be able to record using fraps? Any ideas? I found one but people say the graphics wouldnt be able to handle battlefield if you disagree please say the link is shown below
http://www.ebay.co.uk/...1233013931

Minecraft mac lan for 1.7.4 isn't working properly?

Me and my friends, we all use macbooks, want to play a Minecraf LAN-game. We're connected to the Wi-Fi-network, wich has an internet connection.
When one of us opens a lan game, I can't even see it in the multiplayer menu. Firewall is turned off by everyone. It works about like this:
A=me
B=friend 1
C=friend 2

When A opens a game, it is not visible in the multiplayer menu for B and C
When B opens a game, it is not visible in the multiplayer menu for A, but C can connect and play.
When C opens a game, it is not visible in the multiplayer menu for A, but B can connect and play.

The problem is obvius with mac A, as I see it.

Bought minecraft and it won't work, what's the problem?

I bought minecraft and it won't play. I open the launcher and after i press the play button the green bar takes its time loading and then nothing happens. I press play again and again and nothing happens. I tried deleting everything in the.minecraft folder and re-downloading and non of that works.
please help me

Added (1). my computer specs are high enough. I checked through can you run it

Minecraft error when i try to buy it?

I get the error An unexpected error has occurred which prevented us from completing your purchase. Make sure no money was charged on your account and contact support at https://help.mojang.com/...mojang.com for further assistance i did what it ask me too i don't know why it does this i'm going crazy help

30 fps and below on Minecraft and 60 fps stable on Battlefield 3, why?

How come i have 30 fps and sometimes less on a PC with FX-8350 and a Radeon 6950 on Minecraft? I have 60 fps in Battlefield 3… I know it has with OpenGL to do, but i don't know how to solve it.

Added (1). I have all the drivers for all my devices.

How to make a minecraft defense system?

My friends and I are making a map based on the movie "The Purge", and we were wondering on how we can make home defense systems, just incase an intruder tries to break in. I'm trying to make something as if, with one lever or switch will block all the doors and windows, as seen in the movie. Any help or suggestions will be appreciated.

Desktop disapeared how do i restore?

I don't know what the hell is going on! So i'm just doing the usual, (watching youtube videos & scrolling down my tumblr feed) and i minimized the google chrome and BOOM i have no start menu and my desktop is gone! How do i restore my desktop! My background picture is there but the start menu is gone (the bar on the bottom that had a start menu & the time and stuff) yeah its gone & all my things i had on my desktop is gone (i had a minecraft folder, microsoft works, googlechrome etc)!
I have windows 7 laptop btw
Please if anyone knows how to help please do!

Which is a better video card for gaming: NVIDIA or Intel?

For games like minecraft and league of legends