I have a similar problem since upgrading to 10.04 (final) with a Nvidia GeForce Go 6150. The problem only occurs when booting from battery. It boots fine when the AC cord is in. It can still boot in failsafe mode on battery. When booting regularly on battery, I get a black screen and nothing happens. If resuming to terminal from recovery mode, I can use terminal but will get a black screen if trying to start X. Several other people have reported the same problem on this forum thread: http://ubuntuforums.org/showthread.php?p=9281429.
I have a similar problem since upgrading to 10.04 (final) with a Nvidia GeForce Go 6150. The problem only occurs when booting from battery. It boots fine when the AC cord is in. It can still boot in failsafe mode on battery. When booting regularly on battery, I get a black screen and nothing happens. If resuming to terminal from recovery mode, I can use terminal but will get a black screen if trying to start X. Several other people have reported the same problem on this forum thread: http:// ubuntuforums. org/showthread. php?p=9281429.