Trouble installing Ubuntu Server 12.04.2 LTS with USB stick/key

Trouble installing Ubuntu Server 12.04.2 LTS with USB stick/key

I am trying to install Ubuntu Server 12.04 LTS onto a new system using a
USB-stick. I am to lazy to switch the only SATA CD/DVD-ROM device I have
and use that. Also, I just wanted to know whether this would be an
interesting experience. Not so far...
This is what happened:
I created a new computer with following specs:
CPU: AMD Athlon 2 X4 (soc FM1)
Mobo: MSI A55-P33
GPU : MSI Ati Radeon R5450
PS: 400Watt
Memory: 4GB
no disk player This setup should do the trick.
Then I created a boot able USB stick using various tools pointed out to my
by the support page from Ubuntu itself on the subject on using USB keys
and installing Ubuntu. Because early attempts failed, I tried more then
one of them. I used a USB stick of 14GB.
Then I put in the USB key and started up.
Now, what is the problem? I come into the setup menu, so the stick is
being read. I see the normal choices like 'install Ubuntu', 'install
multiple servers using MAAS', 'memory test', 'disk check' and the rest.
Whenever I try to use any of these, the screen turns black, and the
computer resets. Just like that. The only option from the menu that will
work is the memory test.
What am I doing wrong? Is something wrong with the key? Is something wrong
with my install iso (I used the same ISO to burn on a disk, no problems
there installing it)? Is something wrong with my hardware setup?
I know I can always switch my CD/DVD-rom, but I'd rather loose some more
time trying to get this USB thing under way.