Thanks a lot for your replies. I have solved my problem installing
Windows 7.
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https://bugs.launchpad.net/bugs/693473
Title:
Desktop 10.10 (adm64) causes flickers on ATI card and
Public bug reported:
After a clean installation the screen flickers every 5 seconds. This is
my hardware configuration:
description: Desktop Computer
product: System Product Name
vendor: stem manufacturer
version: System Version
serial: System Serial Number
width: 64 bits