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If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
Here is the manual for your model laptop. Information regarding the inverter (HP Part # 454915-001) and how to disassemble and replace the part begins on page 55. Thanks, and have a great day! If my solution helped you, please don't forget to leave positive feedback!
HP/Compaq motherboards are system specific rather than industry standard. The only way to obtain a new motherboard is to contact HP/Compaq or an authorized HP/Compaq repair center. If you are interested in a used board you can check places like ebay and see if anyone has the board for your system available. Hope this helps.
Check the "Power Options" in your "Control Panel" (classic view). For whatever option you have picked, click "Change plan settings". There you can either "Restore default settings", or manually "Change advanced settings". If you choose "advanced settings", look for "Display" / "Display brightness".