I just means that your monitor settings are incorrect - don't worry, your computer is fine. Try hooking it up to another monitor for the time being, and set the resolution to 800x600 @ 60hz. A low setting like that should get the picture to display correctly again.
When you do get the new lcd - the monitor most likely will not have a problem with your computer. If it does, the first thing you should check is the refresh rate, once again setting it down to 60 hz, and then working your way up to a higher refresh rate. Windows shouldn't let you choose a refresh rate higher than your monitor supports.