Common issue, you can test your screen holding down the D key on the keyboard then power on your system.
http://bootmylaptop.com/dell-d630c-lcd-screen-testing/
You must detect what parts is failure
Screen display, inverter board or lamp
Follow these step.
1.- Connect an external monitor (at VGA port) and check the image in external monitor
If show clear image. The failure may be the inverter board or the lamp backlight
Inverter boars is more easy to replace.
You can buy an used cheap price on
http://www.ebay.com/itm/Dell-Latitude-D630-Inverter-Board-K021048-00-/260809995144?pt=LH_DefaultDomain_0&hash=item3cb97cb388
Replace and your screen will work again
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