My Vostro 3450 started to present a wierd problem, that happens sporadically, about 2x a month. The whole system freezes, and the screen starts flickering like crazy, identical to this video posted in youtube: http://www.youtube.com/watch?v=OjqMH7u_0cg
When this happens, I lost everything I was doing at that moment. I have to force the shutdown pressing the power button for some seconds and restart.
Bios is up to date (A13), all drivers are updated. Pre-boot diagnostics pass with no errors. Complete memtest passes with no problem. I'm using Windows 7 64bits.
Any idea on what is going on?
Carlos