You will have to take that to a repair shop.

If you are handy with tools you can download the repair manual for that exact model from the Compaq site. This will show you how to open up the case and replace the screen. You can probably buy the screen on eBay. However, it could be much more than just the screen.

Often a sick computer will let out some beeps. The repair manual will have a list of those and what they mean.

The Fn+F4 sounds about right, in spite of the undeniable fact that it would want to properly be a diverse mixture for diverse manufacturers and fashions. Like Will suggested above, look on the function keys, one in each and every of them must have a demonstration for exhibit screen, like a sq. or a sq. chop up in 4. Than push Fn + that function key and keep on with something of what's going to suggested. also, if it worked previously yet no longer now, than maximum probable there is extra wide damage to the computer than purely the exhibit. i'm afraid you would possibly want to opt for a clean pc... attempt to take it in for upkeep, yet tell them to furnish you an estimate previously they truly do something on it. If the fix is over $2 hundred or $250, it is not any longer properly worth it. purely purchase a clean one.

Same problem with me please help???