Xsession:warning:unable to write /tmp;X session may exit with an error
 

when i try to login this is the error message i received...After googling about it i found the solution by entering the console.. but the problem is when i type (ctrl+alt+f1) i am getting a black screen only...and just a cursor blinking..nothing else..ctrl+ait+f1-f6 give me the same result..and when i try (ctrl+alt+f7) it goes back to the screen with the error....

Thanking you
Harif..

It looks like you have run out of space in the partition containing the /tmp directory or you have incorrect permissions set for the tmp directory. Post the results of these two commands. You or one of us will then be able to see what the problem is.
ciao,
jdk

@ Harif,

it is also a good idea when posting a problem, to let us know what Linux you are using, and/or add that information to your profile so we can see some information in the side-bar on the left.. Some problems are addressed differently on different OS's.

Thanks - looking forward to seeing the info provided in reply to jdkaye's post above.