In a crash scenario you would see the AppPool as green ... whereas if it were explicitly stopped only then would it be red....
Anyways there are lots of tools that you can use to find out more...
DebugDiag is what i would recommend... it can be downloaded from http://www.microsoft.com/downloads/details.aspx?FamilyID=28bd5941-c458-46f1-b24d-f60151d875a3&displaylang=en
Check these for how to use DebugDiag
support.microsoft.com/kb/919791
support.microsoft.com/kb/919792
Hope this helps...
Regards,
MA Khan
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