Dear Experts,I am using AutoCad 2013 & here i am facing a problem when i am switching my 2D view  to Isometric View. After Switching its showing nothing but when i am switching again to Plan view its appearing.Would anyone help me here.Thanks in advance. 

Hello VICTOR5, maybe you have different objects at Z very different and when you switch to 3D they are so distant that they are very small at each end of your screen.
Try to do a selection to make the grips of your objects appear.

Did you try doing a Zoom > Extents?

ya, i tried zoom > extent .....but result is same

In plan view did you check the Z values of your objects as previously suggested?Upload a copy of the drawing so we can have a look ourselves.  Not an image but a DWG file.
John Connor2013-10-21 15:00:44

We could solve the problem quicker if you responded in a more timely manner.  Move it soldier!

I've seen this happen before when there is a clipping plane active that doesn't affect the plan view.I get this problem often when using CAD files from Architects and Engineers from other companies.   It could also be that a clipping plane is defined in your ACAD Template File without you knowing it.Use DVIEW and see if you can verify that clipping is off. If not, you can now turn it off from here.