Ubuntu 11.10 installed from LiveCD will not boot.

Tried to upgrade from 11.4 to 11.10 with Update Manager...System would not boot.
Loaded 11.10 from Live CD (needed to hold down Ctrl key to get Ubuntu screen...also needed F6 for acpi=off before 'Install Ubuntu' would work).
System worked fine from Live CD. Download seemed to go fine.
On reboot...purple screen, no cursor, no response.
Reboot while holding down CTRL brings up 'GNU GRUB version 1.99- 12ubuntu5' screen and lists:
Ubuntu, with Linux 3.0.0-12-generic-pae
Ubuntu, with Linux 3.0.0-12-generic-pae (recovery mode)
Previous Linux versions
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
Pressing 'Ubuntu, with Linux 3.0.0-12-generic-pae' brings blackscreen and blinking cursor at top left and then black screen with
'BusyBox v1.18.4 (Ubuntu 1:1.18.4-2ubuntu2)built-in shell (ash)
Enter "help" for a list of built-in commands.
(initramfs)'
This screen does not change without reboot.
Pressing 'Previous Linux version' brings
Ubuntu, with Linux 3.0.0-12-generic
Ubuntu, with Linux 2.6.38-11-generic-pae
Ubuntu, with Linux 2.6.38-11-generic
Ubuntu, with Linux 2.6.32-33-generic
each of the above also has a recovery mode.
Pressing 'Ubuntu, with Linux 3.0.0-12-generic' brings blackscreen and blinking cursor at top left and then black screen with
'BusyBox v1.18.4 (Ubuntu 1:1.18.4-2ubuntu2)built-in shell (ash)
Enter "help" for a list of built-in commands.
(initramfs)'
This screen does not change without reboot.
Pressing 'Ubuntu, with Linux 2.6.38-11-generic-pae' same as above.
Pressing 'Ubuntu, with Linux 2.6.38-11-generic' same as above.
Pressing 'Ubuntu, with Linux 2.6.32-33-generic' brings up Ubuntu 11.10 login screen, but the mouse and keyboard do not respond.
Computer - Dell DX-4720
Processor - Intel Core 2 Quad Q8200
Memory - 3 GB
Any help would be appreciated.