How to open dell ms111t - Dell MS111 USB 3-Button Optical Mouse

Here is the sservice manual on how to open the laptop open and replace parts. Hope that is helpful.
http://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_latitude_laptop/latitude-d830_Service%20Manual_en-us.pdf

Go to Dell:
http://www.dell.com/support/home/us/en/19

Here is a link on how to open a Dell SX270
http://support.dell.com/support/edocs/systems/opsx270/en/ug/cvrop.htm#1136140

Here is a link on how to open a Dell SX260
http://support.dell.com/support/edocs/systems/opsx260/en/ug/cvrop.htm#1136140

This appears to be the same for both.

Here ya go
http://support.dell.com/support/edocs/systems/dim3000/en/SM/cvrop.htm#wp1076111

Please try the following two guides


http://support.dell.com/support/edocs/systems/STD1909/en/sm/computer.htm#wp1180372

http://support.dell.com/support/edocs/systems/STD1909/en/sm/drives.htm#wp1109861

http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/mtcvrop0.htm#wp1051283

Download your manual for here. It usually has pictues to show how to open the case. 
http://support.dell.com/support/topics/global.aspx/support/product_support/product_support_central?SystemID=INSP_DSKTP_D531

generally dell monitors open from the bottom they have slight indented flat spaces for a small flat head screw driver to twist and pop the frame apart I start on the bottom left and work my way right and then open the sides carefully and last the top.
Please rate if helpful

http://syscon.wordpress.com/2007/07/13/dell-dell-e172fpb-lcd-backlight-repair/

check out this link for videos on how to open dell LCD monitors.
http://www.lcdrepair.us/Installation.html