Just to make sure you did download the correct latest graphics driver. Here it is:
Get back here with the results.
hi there thx for the reply
i am using windows 7 home premium 64bit atm,already download latest driver from
Download Center.intel.com, but still no luck,and if i tried using external graphic card,windows wont be able to log in
Go ahead and try this other graphics driver at the link below:
If the issue persists try the graphics driver provided by your system manufacturer, and try a fresh installation of the operating system with an updated driver.
Also check with another monitor, and different video cables.