Ubuntu upgraded from 10.04 to 11.04, black screen at boot

Do you know the model of your graphics chip?

To discover your graphic chip please open a terminal from applications→accessories→Terminale and type:

lspci | grep -i vga

copy and paste result here...

Thank you for your kind response. Here are the details of the graphic chip:

lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)

I am using emachines E727 laptop.

Regards,

Do you hear the normal start up sounds when booting with 2.6.38? If so, I'm suspecting an issue with your backlight. Try shining a flashlight on the screen, see if you can see anything.

Indeed, I can hear the normal start up music when booting with 2.6.38, a very very light shadow of the start up screen and nothing more than that.

I am now sending this reply from 2.6.35.28 (previous linux version). At the start up now two options - 1) 2.6.38 and (2) previous linux versions. I have to go for the second option, which will open up a second screen enabling me to select 2.6.35.28. I think, with all changes in the appearance (with a sliding menu on the left, new graphics etc), I am working from the new version of Ubuntu.

Hope, this information is helpful to help me.

Thank you.

The solution provided by unknown47 on http://ubuntuforums.org/showthread.php?t=1743301 worked for me, to be able to edit the files I could get into the system by choosing in grub a previous version, otherwise you should be able to get there using a live cd.