Why won't Minecraft open anymore?

I've been playing for about 2 months and I never had a problem but one day I turned my computer off by holding the power button(which I usually don't do) and when I turned it on later Minecraft wouldnt open so I uninstalled it and reinstalled it and that worked and yesterday my brother turned the computer off by holding the power button(even though I told him not to ) and Minecraft won't open again. I already tried reinstalling I even downloaded different versions but it won't work, what could it be?

What is the best way to make a minecraft diamond sword(in real life)?

I'm trying to make a mincraft diamond sword for an 8 year old boy. He is very harsh on his toys, especially weapons, which he likes to use till destruction and play fights with all the time, usually with other children as well as adults. So I'm looking for materials that are both soft enough for a child to use(and not seriously hurt anyone with) and hardy enough to withstand the amount of the abuse it will surely get. I was thinking of doing it like a boffer sword, with a type of foam (I still don't know what the best type would be) and using the duct tape of the correct colors to bind it and waterproof it. But I'm not sure what type of base material would be best so it is both soft, but hard enough to cut the sword shape and make sure it keeps its shape.
I would appreciate any suggestions.
Thank you

What video game(s) do you enjoy just as much, or more, watching instead of playing?

I like watching Minecraft videos a bit more than actually playing it.

Computer Shuts Down Randomly? - 1

My computer shuts down when doing basically anything other than internet and nothing of course.

I've tried
-Adding Fan To Computer
-Dusting Out Computer
-Moving Objects Out Of The Way
-Boosting RAM With ReadyBoost(Flash Drive)
-Rebuilding The Pc
-Clearing Stuff Out
-Deleting Programs Like minecraft, mcreator, games, simcity, etc

And NOTHING Worked
Please Help I'm LOSING MY COMPUTER

Details:
It an overheating problem i'm pretty sure
Windows 7 enterprise
AMD Phenom(tm) 9750 quad-core proccesor 2.40 GHz
64 bit operating system
8.00 GB ram

Can anyone help please

Good seeds for minecraft PC

I'm using the most recent version,

I'm looking for a world that has a nice mountain over look with a large/mid river or lake that is close to a large or fairly large village, with some flat ground close to it where I can build my house. If you know any good seeds please share them with me.

Which Minecraft Mob Army would win a battle royale?

There are no golems or bosses involved. I know Endermen are the strongest, but spawn in low packs. Zombies and Skeletons are kind of weak and spawn in big packs. Zombie Pigmen and other nether mobs would come out of the nether. Oh yeah, wolves count too.

Added (1). Don't forget every other hostile or neutral mob.

Is 400 dollars a good amount to build a gaming pc?

I want it to at least be able to play minecraft.

What is a good gaming laptop under or around $400?

I want it to play at least minecraft and starwars batt front 2 and it would be nice if it could play skyrim but that is not a requirement.

Why is it so wrong to be honest?

My mom typically asks me when I'm doing, I respond "Watching My little pony" or "Playing Minecraft" sometimes "Watching netflix"
My brother responds to her with "Nothing"(he is playing Minecraft or Wizard101)

When I asked why he does that he said that it wasn't my business and I shouldn't tell my mom everything I do

I'm having mixed messages
(My brother is 18, I'm 14)

What's a good $500 gaming laptop?

Before you say you'll never find one, I'm not looking for a $500 gaming beast. Just something geared towards game performance that can run The Sims 4, Minecraft, Broforce, Portal 2, etc without lag. Please, nothing over $550.