HP Compaq 2710p: External monitor does not display anything
The display properties indicate the hardware is working, so it's likely just a setting.
On HP/Compaq models you will see a picture, usually on the F4 key that looks like a screen with two lines beside it.
You need to hold down the Fn key(bottom left) and then push the F4 key at the same time to cycle between LCD, external or both.
If it is a newer model, a menu will pop up when you do this asking if you want to duplicate the LCD on the external, switch to the external or extend the desktop onto the external. Select the appropriate setting or continue holding down Fn while pressing F4 to cycle between the settings to the one you want.
If you have re-installed the computer at some point with anything other than the factory recovery set this may not work and I will have to give you a longer set of instructions.
If this works please rate this as fixed, if not reply back and indicate what version of windows you're using and I will post the instructions for the "long" way.
Chris Read More At : Compaq 2710p Tablet PC...