My hp computor screen keeps going white how do i stop it

Video card faulty. Have it checked in service please

Probably the problem is not with the monitor. Your computer is defective and probably the lines appear because your VGA is defective.
To make sure your monitor is OK, you can connect it to another computer.
First check replacing the RAMs and then VGA.

It sounds like you're describing the BIOS screen. This is an image that appears whenever the computer first starts up, and only lasts for a second or two, after which Windows begins to start up. Unfortunately, it's not possible to stop the screen from displaying; it's an important part of the boot process and allows technicians to enter diagnostic screens if necessary.

Motherboard has gone out

cause possible: memory bad or loose, bad video card, bad mb. try removing memory and re-installing it (unplugged of course) keeping one hand on case to prevent static.

go to the hp site http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=1153481&lc=en&cc=us&dlc=en&lang=en&cc=us&submit=Go%20» and it has the drivers for vista

Update video card drivers. Start there and if that doesnt not fix problem we will move on to other things.

This can Be a spyware issue...
You need to scan your computer with the following software, If you give some more details i can help better...

The links are as below...
Malwarebytes
http://www.gur.in/j/index.php?option=com_docman&Itemid=58&task=doc_download&gid=97

Smitfraud
http://tinyurl.com/yfxcaz
On the screen push no 2 and then enter to continue... and then on final screen click " Y" to clean registry and then finnaly "Q" to quit....

when you get the window of the printer go to preferences , then on top of window click color , then where it says COLOR OPTIONS , unclick the PRINT IN GRAYSCALE (uncheck the box) then click OK . and try again . hope this helps

check the frequency or PAL, NTSC, etc look for these settings, test it one by one