When I boot Ubuntu 10.04.3 from a live CD, it asks me to enter a username and password. I have not booted before, and I haven't created an account.
I tried to install Ubuntu 11.10 from a Live CD and from a USB pendrive, but when I choose try Ubuntu or install Ubuntu from the boot screen, all I get is this message: "out of frequency range" and the monitor turns off in few seconds. I use an nVidea GeForce FX 5200 graphic card.