Constant jitter on screen

Open control panel and go to display. You can reset the screen resolution there if your monitor will accept it and your display card will generate it.

Go into control panel, click display, settings on the top right, set the color quality at max and the screen resolution also at max, click okay to save settings and monitor should adjust accordingly, if not set monitor to auto setup.

Here is the manual: http://www.retrevo.com/support/NEC-LCD1770V-Monitors-manual/id/279dj981/t/2/

I believe you can turn off the resolution warning using the on screen setup menu.

Try to change the desktop display settings, see screenshots below, see if it works

Right click on your destop and go to properties > settings

1. Set your Screen resolution to 1280X1024
2. Then click advanced and go to Monitor and set the refresh rate to 60 Hertz.
   

on your desktop, click on the right click on the mouse. then go to properties, and screen settings. you can change the resolution from there. I would also recommend you to work on 1280x1024 as it fits best on the 17' you purchased.

I had a similar problem on my laptop

I plugged the tablet directly into the laptop rather than the USB hub I'd been using until then, The issue disappeared.

Possibly it's a power issue, and going direct cured it?

when u power up press F8 key then go to enable vga mode then set resolution to 1024*768 thne check .

it happens because you have selected( accidentally or otherwise) the resolution that the monitor cannot handle easily. So each time turn on the computer the screen tries to adjust itself to work with the resolution that you have selected. Select a screen resolution that the monitor can handle and work with.

If you go to the FAQ section for your board you will see that the screen resolution can only go to 1600x1200 UXGA, UXGA+ res name pixal depth 8/16/32
http://support.asus.com/faq/faq.aspx?SLanguage=en-us&model=P5VDC-MX

FAQ page 4