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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
If you boot your computer, and after loggin in you receive a Black Screen but are still able to see the mouse move, try bringing up your tsk mngr (Ctrl+Alt+Del) then go to proccess' and click end proccess on explorer.exe then go to applications and press new task then type in explorer.exe, this should solve the problem, if not then I am sorry, that is what solved my problem.
there must've been some prob with the mousepad/ external mouse driver.go to control menu->double click mouse->choose hardware tab->properties->driver->update driver... do this with ya motherboard/laptop cd/dvd in the cd/dvd rom. choose search software driver automatically. once ya done. restart and start using mouse as before.
"Unmountable boot volume" this problem is your hard disk partition which is failure to recognize & identify the operating system running on the hard disk. Reformat your hard disk and put another operating system to run again your computer.
your projector may be on the 2nd screen or presentation mode of your video card. open an application and drag the application window off your screen (try both sides) and see if it will appear on the projector.