How to look at what is going on in a pegged SQL Server instance?

I have a SQL Server instance that is pegging out my server. I'd like to look at what jobs are running, but it's so slammed that I can't even log in.

Is there some secret way to get in and look at whats running when the server is slammed or do I just need to yank the plug out of the wall?

UPDATE: I tried connecting using DAC but it threw this error message:

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Try the Dedicated Administrator Connection (DAC).

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