Solved!!!!I 
Basically the problem was that during installation I have had my external 
proyector attached to the vga out, it was turned off but plugged in, and the 
video card and/or grub gets confused and does the boot for the external 
monitor, even if it is turned off,  and then starts the normal monitor whith 
the login screen of ubuntu, so if the external monitor is off you simply see 
the normal laptop screen off. 
Solution then, in my case, was unplugging the external monitor during 
installation . Also it could happen again if you boot with your external screen 
turned on. The steps for me where to install another Linux (Debian)  jn  dual 
boot, and at a certain point, don t remember exactly, I realized that the 
problem was solved. Actually inn Debian the problem may happen as well  but 
differently than Ubuntu it autocorrects on next boot if the external monitor 
cable is unplugged, and it solves the problem for both systems, of course. If 
you ask me to solve it without installing Debian, I don t know how to do it. I 
hope this helps somebody else. If someone ever reads it, or happens to have the 
same funny problem!

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Black BIOS  and Grub screen with 9.04
https://bugs.launchpad.net/bugs/375097
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