I might be able to help if you were more specific. Are you getting a black screen?
Try opening the task manager and ending the process tree of "javaw.exe"
If that doesnt work, press the Windows Button and R at the same time to start Run. Then in the run window put in "%appdata%", right click .minecraft and delete it. Then reinstall Minecraft, and if that doesn't work, then you might have to restart your computer, or something else.
I have been playing minecraft for a while, with no problems on my Mac.(legitimate) And then, all of a sudden it wasn't working. I would open it, go to worlds, select the world, and then it would crash! So I thought the problem was that I had mods. So I deleted the minecraft folder, let the game make a new one, and it still crashes when I try to play a world. I have minecraft 1.7.3. I have Java, I don't see the problem. I have OSX Snow Leopard.
On a PC...:1) click start
2)search "run"
3) open the run window
4) type in %appdata%
5) open your roaming folder (should pop up, but may already be open. In that case just skip this step.)
6)open your .minecraft folder.
7) open your bin folder.
8) delete the minecraft executable jar file.
9)play minecraft. It should update now.
NOTE!!!: This WILL delete all mods if you have any installed. It may also reset your stats/achievements.
I'm assuming that you situation is something along the lines of that you downloaded a custom map and when you try to get out of Adventure Mode or Survival Mode Minecraft say that you don't heave permission to use the command. To fix this, open you Minecraft world to LAN, to do this got to the Minecraft options and click the 'Open to LAN' and allow the cheats. This should give you all of your commands back and let you spawn in items and change your gamemode. There is one bad thing to doing this though, once you disconnect your world from LAN, you won't have the commands unless you open you world back up to LAN.
You could go on Minecraft.com and try a different download instead of the 1st download.
Uninstall and reinstall Minecraft.
You need Java.
you need to be in multi-player or a server to make the TNT work.
Sometime you have to press fn to make it work.
Make sure you port forwarded it correctly.
The mod developer will need to update the mod to be compatible with the new Minecraft version.
Unless you work for Mojang, I don't think you can make an update. But, what you could make is a Mod.
First Make sure you closed minecraft COMPLETELY then install the skin (re install) It should work correctly if not you don't have a premium account
Beds were not introduced into Minecraft until Beta 1.3, so no.
Minecraft 1.4.6 mods will work with 1.4.7 sense they are both a 1.4.
The pocket edition of minecraft doesnt have crafting, therefore doesnt need one. Its a crafting table btw.
I didn't make Minecraft.
yes but you have to download minecraft if you want it to work