Dell 8400 won't boot up.. sounds like a jet!!

Hi guys i have a big problem with my dell 8400... I was just surfing on the web, but suddenly it just shut down and when i try to restart the computer it wont boot. There is just a LOUD sound like an airplane!

What should i do???

All the light behind the computer are green except for B
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  1. Sorry for double post but i forgot to write that the Fan is getting louder and louder for every second.
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