Thanks Ubuntu for its great OS, two months ago I bought a new Computer to begin learning and using Ubuntu and I had very little problems until yesterday.
Two mounts ago I did successfully install the following ISO images from a DVD
ubuntu-10.04.4-dvd-amd64.iso & ubuntu-11.10-dvd-amd64.iso
Yesterday I could not install from neither DVD nor USB drives:
ubuntu-12.04-desktop-i386.iso & ubuntu-12.04-dvd-amd64.iso
I succeed to get the first 'ascii' screen only when I immediately press the Escape key (otherwise I get nothing at all), I select then the correct install menu but I get nothing but a dark screen. However it seems that the install menu changes into graphical screen.
In the same computer I can actually install ubuntu-10.04.4-dvd-amd64.iso & ubuntu-11.10-dvd-amd64.iso).
In another oldest computer I can also install ubuntu-12.04-desktop-i386.iso
THE NEW COMPUTER IS:
Machine: Mobo: ASUSTeK model: P8Z68-V LX version: Rev X.0x Bios: American Megatrends version: 3506 date: 01/17/2012 CPU: Quad core Intel Core i5-2500K CPU Graphics: Card: nVidia Device 1244 bus-ID: 01:00.0 X.Org: 1.7.6 driver: nvidia Resolution: email@example.com GLX Renderer: GeForce GTX 550 Ti/PCIe/SSE2 GLX Version: 4.2.0 NVIDIA 304.37 Direct Rendering: Yes Audio: Card-1: Intel Cougar Point High Definition Audio Controller driver: HDA Intel bus-ID: 00:1b.0 Card-2: nVidia Device 0bee driver: HDA Intel bus-ID: 01:00.1 Network: Card: Realtek RTL8111/8168B PCI Express Gigabit Ethernet controller Drives: 1: ATA ST3500418AS 500.1GB 2: USB U3_Cruzer_Micro 2.1GB Optical: HL-DT-ST DVDRAM_GSA-H60N