Hi there, and welcome to the Forum:
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Can you tell us why you had to reinstall your Windows7 on your Pavilion laptop?
There are 4 problems that typically cause a blank screen problem on laptops:
1) Failed laptop battery
2) Failed LCD panel display screen
3) Failed embedded graphics chip on the Main board
4) Faulty hard drive.
The easiest things to do are swapping external components around to troubleshoot which problem you have. Of course you could also take to your local Computer Pro and pay a Tech to diagnose for you. Make sure you get a written estimate for the repair (parts & labor) after the diagnosis.
To do yourself start here:
For #1): shut off the laptop MAINS power by unplugging your AC adapter from the Wall Socket. remove the laptop battery. plug in the AC adapter back into the Wall socket. If the display comes back, you have a faulty battery, and it must be replaced. Decent replacement batteries can be had for $65-$85 US online.
For #2): borrow or buy an external flat screen LCD monitor (you can use an old CRT if you have one laying around, but LCD isbest), and plug into the VGA video port on the side or rear of the laptop. You may have to use a switching-key sequence such as
<Fn-key+F5> or
<Ctrl-F7> key while the laptop is booting up to tell the laptop you wish to use an external display source (the LCD or CRT) to display all information on instead of the internal LCD panel display. If the laptop now displays on the external Monitor, you have bad LCD panel screen and it must be replaced. This is best to have done buy a repair shop if you've never done it yourself before.
For #3): If the result of Test #2 above is that you get no display on the external monitor (no bootup flash screen showing HP logo; we call that the
"splash screen" or the Windows login screen or BIOS), then the embedded graphics chip on your Main board is toast. This means a very expensive Main Board replacement; typically $175-$400 or more in the US; up to $1500 or more if outside the US. That graphics chip is soldered (hardwired) into the Main Board circuitry and cannot be replaced by normal means.
For #4): The hard drive needs to be tested and or replaced. You can download the free
SEATOOLS drive diagnostic from seagate.com. Instructions for making a bootable test DVD or USB stick with the
SEATOOLS program on it are on their site. Once you boot from either media (DVD or USB) and run
SEATOOLS, make sure you run both the short and long versions of the test. If
SEATOOLS returns errors, your hard drive has failed and must be replaced!
Note on #4: If you find your Hard Drive has indeed failed, you can remove it from the laptop with a few screws (download free users manual from support.hp.com and it will show you how and where to do this), and replace the hard drive yourself. New hard drives depending on capacity and type are often under $100 on ebay or amazon. Most shops in the US charge $140-$200 for the replacement and Windows reload. Since you don't have the Recovery Discs and used the Recovery Partition, expect this to be more. Set your faulty hard drive aside to attempt
Data Recovery if you didn't remember to backup your personal data either. Post back for instructions on how to do that. You can also pay to have the
Data Recovery done on that bad drive; that runs from about $35-$250 or so depending on how badly the hard drive is physically damaged.
Further note: It's never a good idea to attempt a Windows factory Recovery from a built-in drive parition without the Recovery Discs you forgot to make; in Computers over 2 years old, the hard drives have often begun to fail or have completely failed, in which case the files on the built-in Recovery Partition cannot be read back properly due to read sector error corruption, and therefore they get stuck during the reinstall process, as happened to you. The Recovery partition should only be run upon testing the hard drive for full functionality, as that process only works about 30% of the time even with a good hard drive. Of course, most home users wouldn't know this; but you do now. This same caution is why you should
NEVER attempt a factory Recovery or Reset
WITHOUT BACKING UP ALL YOUR PERSONAL DATA (DOCUMENTS, PHOTOS, MUSIC, VIDEOS, EMAILS) TO EXTERNAL MEDIA FIRST!!
These are the most common remedies to your problem. Give them a try and let us know how it turns out.
Best of luck,
<<<BIGBEARJEDI>>>