Way to tell whats under defined

Start grabbing endpoints and dragging them around. If defined, they won't move.

Do you have text in the sketch?

Can you do a snapshot of the sketch?

Pull and drag is common method, also you can turn on your relation nodes to help see.

JM

You will get a note at the bottom of your screen saying that the sketch is underdefined, if it is so...!

Naga Ranjithkumar

Attach your file here and end all doubt.

Sometimes the sketch is fully defined but it's location may not be.

Steve C

OK, a couple of things:

1) There is a possibility of an "unintentional" micro line: Tiny unintentional sketch lines

If this is the case, then using Repair sketch will locate it for you.

2) If there is text in the sketch, then Sketch Text is hard to fully define (even though it IS fully defined, Solidworks says that it isn't).

Fully define sketch text?

I've also seen files posted here with the same problem, that had multiple sketch points on top of each other.  Some were fully defined and some weren't.