Help on multi-Instance on a server

Hi,
I used NT instance manager create an instance and database, and the serveice of that can start but I cannot start up the instance. How should I do?
And , after setting the sql*net, I cannot conect to the new instance, it tells me "tns:listener could not resolve SID given...", I think I hvae set the SID in sql*net conf rightly. What's the reason? Thanks for any help.

Ming Ouyang

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