Computer Monitor Screen turns white twice upon boot up? Do I need a new monitor?

Ok so I'm not very computer savvy, so any computer answers that can be explained in the most simple way possible would be great. The break down:

I bought a new computer tower last year. I checked for any viruses and found a few but they were taken care of. My monitor, however, is about 6-7 years old. My monitor so far has had no major problems, other than this white screen appearing when I turn the monitor on after booting up the computer. Before it just showed up once and now the white screen shows up twice upon computer start up. Sometimes when I turn my monitor on and boot up the computer all I get is a black screen on my computer even though the tower is on and everything is a green light for go. When this happens, I find that I need to turn my monitor off and then back on again in order for the monitor to show the main screen with all desktop icons and such.

I am running a windows 7 certified data computer (the brand). I originally thought this may have been the work of a virus as this has been consistent for at least 2 months now (if not 3) and my scanner did find one or two viruses but they were removed and this problem persists.

So as my monitor is at least 6 years old, do I need a new monitor? Other than the white screen showing up twice upon start up and the occasional turning the monitor power on/off, my monitor works just fine. It does sound like it may be beginning to kick the bucked but I'm not sure and it's hard to say. What do you guys think?