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If you're booting up the device and it goes thru the Post test and then goes to a black screen this usually means your OS has crashed.
You will need your Operating system or Recovery Disk.
I hope you've backed up your data and files.
It appears the hard disk has been wiped/formatted and does not have an operating system installed.
You need to get a Windows Vista installation CD and if the Windows label
on the bottom of the laptop is still attached then this label has the
product installation code.
Boot up with the Windows Vista installation CD to install the Vista
operating software then you need to install the Presario device drivers.
You can download the device drivers from the Compaq/HP WEB
support/download page. Make sure you select your model laptop and the Windows
drivers you require and install them. Click on this link to download the
drivers: - www.compaq.com/country/cpq_support.html
It seems to be a problem with your operating systems (Windows perhaps). If you are not an experienced user, have it checked by someone else. The easies way to check whether the computer is OK is to boot some Linux Operating System from the CD, or at least insert windows installation cd and try to start the installating procedure. You will see the option to repair the current installation.
Does it boots windows? If the screen gets blank after Windows booting up, you can try repairign the OS. If the whole unit doesnt boot up, then the hardware must be in problem. Check the Hard disk, the power supply and the RAM.
Try taking out your battery and leaving it out for 5 minutes. During boot press F2 to access BIOS to check your default video out source is LCD. Also try Fn+F5 to change the modes of video after you think windows is all the way booted up. Does it POST? When booting does the drives make noise then hear a beep. If it beeps it passed Power On Self Test.