FW Screen Goes Black at any time

Hi guys, i just got my sony vaio FW 250JH two days ago. From the very start of using my pc, When i boot it up, shows me the welcome screen of vista, and then, suddenly the screen goes black and only I can see is the arrow of the mouse. Then, i have to wait a considerable time to finally get into the desktop.

Also, when in running whichever program, application or just browsing the web, the screen makes something like a "blink", gets black for a second and then goes good again.

Does anybody know anything about this problem? and how could I resolve it?

Thanks in advance!

 

I have this problem as well, but it is intermittent and I believe it is primarily caused when I'm booting from hibernation, and changing from power outlet to battery while in hibernation may have something to do with it as well. I just don't know, nor have I figured it out.

 

have you proved reinstalling vista?

 

I guess this is normal, mine when I run a program for example Ccleaner it blinks for a second.

And yes I formatted mine with a fresh Windows Vista install.