I installed a refurbished system board in my Dell Inspiron 1501 laptop with a AMD Semprom 1.8 ghz processor. Wheen I turn on the computer the power light is lighted but the LCD screen is dark as if not lighted. after a few second while on ,if I press any key on the key board it will beep and sometimes stay beeping until I press another key. Does anyone know how to fix this problem? Also it is using Vista 32 bit as an OS.