It never stops running

[carandache]

Hi
I try to crack a phpbb3 hash but this is my very first time and it looks complicated to me.
I tried to do something but I wait some hours and nothing happened.

But I'm not even sure I use it like it must be used ! Although I swear I look for tutorials... I found some, but I didn't understood them so... Here I am

Here is what I did:
I opened cmd
I went to the oclHashcat directory
I put:

Code:

cudaHashcat-plus32.exe -m 400 mdpcry.txt -o mdpdec.txt

And it never ends.
The password crypted is in mdpcry.txt and I want the result to be written in mdpdec.txt
I read that I should use rules, dictionnary, things like that, but I have no idea which ones I should use!
If it can help Hashcat, I have an example of an another password crypted (with the same "key") and not crypted, but I don't know if it's helpful, and if it is I don't know how.

I really wish somebody will have the patience to help me, because it looks like I spent the whole day trying to do something that is not that hard...

PS : I also read somewhere that using oclHashcat-plus may be dangerous for the computer ? Because my laptop used to get very hot, but since I cleaned it and add a little fan under it.