I have a Dell laptop. I can be typing merrily away, when the blinking cursor (which is usually immediately after the last character you've typed) disappears, and I find that what I am typing no longer appears on the screen. It isn't after any particular letter and seems totally random eg sometimes it happens after 20 words, sometimes after 2 characters. I have to watch the screen the whole time, to see if what I'm typing is making it onto the screen. If not, I left click after the last character on the screen and can carry on emailing,writing a letter etc. It's very annoying. I have no idea what causes it. Can you help, please?