CRM 2013 UI issue

hi there,

We're upgraded to CRM 2013 when I try to access the CRM 2013 (on-pre) the UI disturbed, ribbon not displaying window not opening properly. I've try to add it comparability mode view but there is no use.

I face this issue in IE only. version IE 11

my url is http://www.mycrmsite.com:1234/myorg

Please suggest.