Volume on laptop stopped working

HP Pavilion dv7 Notebook; Windows 7 Home Premium
No upgrades...was working fine a few days ago

Hi,
Re you talking about the Quick launch volume buttons at the top...
You can try this if it is the quick launch buttons:
Use Hard Reset to Resolve Hardware and Software Issues
Note:
If you have HP Support Assistant installed on the computer(The Blue Question Mark) then open it ==> Complete all pending Updates & Tuneups==> Restart and Check. It may solve your problem
Although I am an HP employee, I am speaking for myself and not for HP.
**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

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Very simple take it to an Apple Store or AASP and have it professionally diagnosed. Anything else would be guessing. Do NOT spend a penny on it until it is professionaly diagnosed otherwise you stand and excellent chance of throwing good money after bad.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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, Hello and thanks for posting on the HP support forums. When it comes to a bios update the rule is if it isn't broke don't fix it. If it is locked and not responding then the only choice you have is to do a hard reset first. HP Notebook PCs - Performing a Hard Reset or Forced Reset Once you have done that here is a link for doing a bios recovery. HP Notebook PCs - Restoring the BIOS Thanks again for posting and have a great day.

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See the instructions provided here.
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Hey @cjdean1983 ,
Welcome to the HP Forums!
I understand the touch screen has stopped responding on your Omni 10 tablet.
If you have already performed a recovery and BIOS update the only option I can provide is to contact phone support.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the following link to get the support number for your region: Phone Assist Worldwide.
Thanks!
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
I work on behalf of HP.

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Back up all data before proceeding.
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SMC reset
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
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Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

HT1941 My laptop stop working all of a sudden

How would I know if my laptop still under warranty and why it stop charging and power on all of a sudden?

Warranty
Click  in the menu bar.
About This Mac > More Info..
Click "Services" tab at the top, then click the arrow beside
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Battery charger
    Reset SMC.     http://support.apple.com/kb/HT3964
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If this does not help, contact Apple.

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Try these suggestions:
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Volume down (-) has stopped working

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Have you tried the ear buds in another iPhone to see if the problem is the buds or your phone? Alternatively, have you tried another set of buds in your phone?
In any case, warranty on the buds is the same as the iPhone, one year (without AppleCare). If you're within your warranty period, you can always bring them to Apple for evaluation.

Volume on laptop stopped working

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