Solve the problem of the black screen and flashing keyboard on backtrack 5

I loved to these night to talk about the problem happened to me and I managed to fix it today after two days of searching the problem lies in the Taatbeth latest version of Pac 
backtrack 5 Trac 
   dell vostro 3500 on computer 

Which I've never broadcast it copy Trac Pac knowing I Mtbut version and works well in another laptop computer possessed, 
The problem is when I do Btaatbeth on a computerized version of the type 
startx discernible when your root and the powers it Azkhal 
Tdahr permeated black keyboard indicator starts to flash 
Find grub after I discovered that the problem in 
McCann all I have to do is the following 
After the powers discernible your root type the following command 
vim / etc / default / grub 
Look for this line 
GRUB_CMDLINE_LINUX_DEFAULT = "text splash vga = 791 
i type 

i915.modeset = 1 Add a line to the other in these circumstances Value 
To become so 
GRUB_CMDLINE_LINUX_DEFAULT = "text splash vga = 791 i915.modeset = 1 
escap / echap been in the press on the keyboard 
x: then click at the same time on each of the 

At last I hope that the article be shown useful for both got the same problem with him