IPhone 4 stuck on apple logo?

I have iPhone 4 version 4.3

I was jailbreaking my iPhone using redsnow and something went wrong with my iPhone.
when I click on "just boot… " the process gets stuck on "waiting for iPhone 4" (this is what is written on my screen) nothing happens on my laptop screen after this and my iPhone gets stuck on apple logo.
I tried to "just boot" it again a lot of time but I still get the same problem.

What should I do? Please give a simple answer which I can understand. Not too long please.
Thanks

Oh and I also tried installing the whole thing again but it still gets stuck.

Plug it into your computer and restore it to original settings or hold the home and lock button at the same time for 30 seconds or I think it's 15 seconds… Just try 30 first.

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