After Login Keyboard Problem

Hi all,
i’m using sled-11sp2 32 bit with gnome only with Dell inspiron.
problem is, before login i.e., on bios or user name/password prompt every key is working properly, but after load the gnome GUI (desktop), no key is working properly, i have to press a long time on every key to take effect, even on terminal also,

Can any any one help me to solve this horrible problem

I was going to suggest having a look in the Keyboard section of Control Centre but I can’t see any options in there which might create the behaviour you describe. If you press ctrl-alt-f1 then log in there does the keyboard work as expected? (Press ctrl-alt-f7 to get back to GUI). If you create a second user and log in as them does the keyboard work as expected?