How to fix my Sony television?

I have a pretty old Sony trinitron maybe 7 years old or so. I've been having problems with it lately, it acts up most of the time (I would say it acts up about 98.9% of the day) and its starting to get on my last nerves. The problem is the t.v. will buzz, then the pictures turn gray, then it blanks to grey with the picture still there and it does this repeatedly for hours at a time. Also its make an anooying sound.