Re: Help installing Ubuntu 12.04 LTS 64-bit
I personally have to enable the nomodeset parameter to get my PC to boot off my Ubuntu live media. You said you tried that and it hasn't helped. I'm not sure exactly what the problem is.
To further narrow down other possibilities, have you tried using your Ubuntu live USB stick on other working PCs? This would eliminate the possibility that there is something wrong with your USB stick.
Gigabyte GA-P45T-ES3G LGA 775 Intel P45
Intel Core 2 Quad Q9650 @3.0GHz
16GB RAM DDR3 1333MHz
EVGA nVidia GeForce GTX 560 Ti 2GB