Blank screen when trying Ubuntu 14.04 on AMD A6-5200

MySense

Using unetbootin i created a boot USB, disabled fast boot and secure boot. Correctly switching to boot from USB
It gets to the grub boot menu, I choose option to try Ubuntu without installing, nothing happens just blank screen - have to press power button to reboot, Could not even get the console when issuing Alt+1/2/3...8.

I have also tried downloading a fresh ubuntu binary and recreating the USB boot drive.
I have tried editing the boot options, by adding 1) nomodeset still the same problem and 2) acpi_osi=linux acpi_backlight=vendor this one atleast gives me a linux console, but cannot get the graphical interface working.

tried the options "acpi_osi=Linux acpi_backlight=vendor nomodeset" - even with this the result is the same, only console no graphics.

Searching around, looks like
AMD HD8400 graphics card needs a AMD proprietary "Catalyst" Driver.
This catalyst driver supports Ubuntu 12.04.2 and 13.04 ( http://support.amd.com/en-us/kb-articles/Pages/Latest-LINUX-Beta-Driver.aspx)

it's worked for me till I can get the right drivers installed. Get to a terminal prompt and type in:

1. sudo Xorg -configure
   
2. sudo mv ./xorg.conf.new /etc/X11/xorg.conf

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Restart after that