I replaced a laptop screen in a Dell Vostro 1520. Both the old and new screens are 1440x900 resolution as confirmed by part numbers but new screen is glossy the old one is matt - with slightly different part numbers (B154PW02 old, B154PW01 new).
Now Windows 7 says the maximum resolution with the new screen is 1200x800. Can't be set higher to 1440x900. When Bios messages show at start up the resolution is clearly wrong with half the text off the screen.
What can be wrong?
[Edit: have now updated the bios to latest version and reinstalled video drivers. The replacement screen (model B154PW01) is a few years older than the broken screen B154PW02. The video software (intel) does not detect any supported resolutions above 1200x800 still.]