Connect projector to HP desktop - HP Pavilion a705w PC Desktop

That might be because of the weak or bad connection of computer or the projector. Also you should check whether the projector is out of order or not.
http://mhelpdesk.com/field-service-management-software/

You should be able to. It will somewhat depend on what video connections your PC has and what the projector will allow. If your desktop does not have the correct connections you can get a video card that should have what you need. Here is a link to video cards from a reputable dealer.

Install the driver of your video, here is the link http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=ob-75553-1

try pressing FN on your keyboard then press F3 = FN+F3 at teh same time to project waht is in the laptop to the projector........

if not go to desktop right click anywhere select display properties it should give you the option to select the monitor and projectors detected by the laptop to show what is on you laptop as well posbbile u will need to either expand or if the option cloning will be present to have both show on the laptop and desktop ^_^

Are you saying that the projection is solid blue? Is it similar to, say, the desktop on the laptop screen? Try moving your mouse off to the right side of the laptop. Did it show up on projector? Exciting! Try dragging stuff over. Damn, this is sweet.

PC either driver missing or wrong one. 
GO to the HP website with you model number and the version of windows that you are running and download and install the driver for your icd projector device for your computer . It must match the version of windows that you have. If one is not availavle then you cvannot use the device with the computer untill one is written. 
http://welcome.hp.com/country/us/en/support.html

What resolution is your projector capable of ? Are you running your computer in the same resolution?

I discovered that my laptop supports two monitors and the projector was acting as monitor #2. By changing the priority of the monitors I have got the information I need on the screen, but now not on the laptop. However, I can work the two from the screen and that will suffice for the moment, until I can find a way of getting the information on both!

You can connect the Projector to the VGA Port of the Notebook which is a Blue Port which can be seen at the rear of any desktop computer to which we usually connect the Monitor to.

The VGA Port will have 15 holes on it and should be in Blue colour.

You can locate the VGA Port at the Left side of the Notebook.

Locate the port according to the information available below :

http://h10032.www1.hp.com/ctg/Manual/c00726464.pdf

Refer to page number 14 (18 of 32) in the manual.

Once you connect the Projector to this port, hold the FN key and press F4 key once.

This wil get the Display on the Projector connected to the Notebook.

If you just want the display only on the Projector, hold the FN key and press the F4 again.

Now, if you want the display back on the LCD of the Notebook, Press the FN + F4 third time.

Hope this helps..

on your display properties, switch windows to appear on your laptop. and do not connect your LCD when booting your PC. there is an option in display property that says extened your windows to this display... that is your LCD.