What is the main conflict in Hamlet? Is it external or internal?

I think the main conflict is internal... which is why the "to be or not to be" speech is so famous, and why there are so many essays written on hamlet's madness, etc. Really the conflict comes about in Act 1 when Hamlet's father's ghost asks Hamlet to avenge his death, and Hamlet has to decide what kind of person he is: a murderer, or a peaceful soul... there are a lot of great essays in the GradeSaver link on "Essays on Hamlet"... well worth the $3 or $4 bucks, and you'll get lots of useful quotes and insights... good luck.