My desktop monitor is flashing once before it loads, when I log into other places via Firefox.?

Question

It's been doing this for a couple of days now - why?

Update:

... and how can I fix it?

Update 2:

What's happening, and it's only just started, is only when I try going into my usual areas, Email, Yahoo, Ebay etc.etc.   My screen flashes once and then the page loads.  It ONLY happens when I go in via Firefox.  Using Chrone or the old IE, - no problem.  I guess I have to ask my Computer Expert in town, again!

Answer 1

your video drivers need reinstalled. go to your computer manufacturer's support website, and get the drivers for your model.