Hi,

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Since the system originally had another version of Windows did you run the Upgrade Advisor and
check the Compatibility Center for the CD/DVD compatibilty (and other devices as needed).
Windows 7 Upgrade Advisor
http://www.microsoft.com/windows/windows-7/get/upgrade-advisor.aspx

Also check the Compatibility Center (check for major devices)
http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx

1. Is Windows or your disc burning software not recognizing the writable CD or DVD drive in your PC? Use this document to resolve this issue in Windows 10 or 8. CD/DVD Drive Is Not Detected (Windows 10, 8). Go to the HP website to see if there are any drive firmware and/or recording software updates available. Use the following steps.
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3. Have a HP DVD840 in a case that runs via USB port. BIOS sees the drive just fine, but Windows 10, and in fact, when I had Win8.0 & Win 8.1, Windows did NOT recognize the dvd.
4. Ultra Thin 8X DVD Burner CD Player Portable External USB 3.0 Optical Drive for HP EliteBook 850 840 820 755 745 G4 G3 G2 G5 Ultrabook Business Laptop DVD+-RW DVD-RAM DL 24X CD-RW Writer New in Box.
5. After I upgrated to Windows 7 Ultimate. I am unable to copy anything. HP Support & Drivers. CD/DVD drive does not appear in Windows Vista, or you receive this.

Check with the System maker and the Device maker for information about drivers for Windows 7.
Check with HP Support, their on-line documentation and drivers, and their forums.

HP Support & Drivers
http://welcome.hp.com/country/us/en/support.html
Contact HP
http://welcome.hp.com/country/us/en/contact_us.html
HP Forums
http://h30434.www3.hp.com/psg/
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Check these :

The DVD drive does not function after you install Windows 7 - these are different Sony drives
however the same issue could be affecting your drive.
http://support.microsoft.com/kb/975270/

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Your CD drive or DVD drive is missing or is not recognized by Windows or other programs
http://support.microsoft.com/kb/982116

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If the System can run Windows 7 AND there are drivers for the devices these might help :
References to Vista also apply to Windows 7.

Stage 1 : Please do all the below even if you have done some before as it is often the total
process which solves the issue.
Try this - Control Panel - Device Manager - CD/DVD - double click the device - Driver's Tab -
click Update Drivers (this will likely do nothing) - then RIGHT CLICK the drive - UNINSTALL -
REBOOT this will refresh the default driver stack. Even if drive is not shown continue
below.

Then work your way through these - remember the drive could be bad, could have a loose
cable or slight corrosion on the contacts (usually for a laptop) and other issues.
Your CD drive or DVD drive is missing or is not recognized by Windows or other programs
http://support.microsoft.com/kb/314060 - a Mr Fixit

Manually try this fix if the 314060 Fixit did not work
http://www.pchell.com/hardware/cd_drive_error_code_39.shtml

Your CD drive or DVD drive is missing or is not recognized by Windows or other programs -
a Mr Fixit
http://support.microsoft.com/kb/982116
The CD drive or the DVD drive does not work as expected on a computer that you upgraded to
Windows Vista
http://support.microsoft.com/kb/929461
When you insert a CD or a DVD, Windows Vista may not recognize the disc
http://support.microsoft.com/kb/939052
Your CD or DVD drive cannot read or write media - A Mr Fixit
http://support.microsoft.com/gp/cd_dvd_drive_problems
CD/DVD drive does not appear in Windows Vista, or you receive this error during Windows Vista
setup after booting from the DVD (AHCI)
http://support.microsoft.com/kb/952951

CD-R drive or CD-RW drive is not recognized as a recordable device
http://support.microsoft.com/kb/316529/
Hardware devices not detected or not working - A Mr Fixit
http://support.microsoft.com/gp/hardware_device_problems
Another possibility is that the cables are loose. Remove ALL power, then check cables in both
ends. Remove and replace, do not just snug. For laptops you can often clean the power and
data contacts with a pencil eraser.
Some DVD drives do not use the Windows default drivers so check with the System maker and
device maker to see if there is firmware or drivers for you drive if needed.
Stage 2 : You could have drive issues as the CD/DVD is actually 4 drives in 1 case ( CD & DVD
burn and CD and DVD read). So it is not unusual for 1 or 2 parts to not function while the others
do so properly.
Did you complete the troubleshooter for the drive that still does not work? There are some
registry entries that the troubleshooter does not fix and those 'might' be the cause.
Check with your System Maker and Device maker for both possible firmware updates and the
correct Registry entries for your drive.
These are the keys I think are the ones in question - for the CD/DVD drive sub-keys of course
as there will other sub-keys in these keys. Be sure to ask for specific keys involved as well as
the settings.
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumIDE
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetHardware Profiles0001SystemCurrentControlSetEnumIDE
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E965-E325-11CE-BFC1-08002BE10318}
-----------------------------------------------------------------------
You probably can find more info here and maybe even the exact registry settings for your CD/DVD
drive from someone with the same model.
Forums - a lot of real expert help
http://club.myce.com/
CD/DVD units
http://www.myce.com/storage/

Use DevManView to locate CD/DVD in registry (be careful and make a Restore Point before
changing anything) - find the device in DevManView and then Right Click on it Open in RegEdit.

Hp Dvd 840 Driver Download

DevManView - Free - an alternative to the standard Device Manager of Windows, which displays all
devices and their properties in flat table, instead of tree viewer
http://www.nirsoft.net/utils/device_manager_view.html
Hope this helps.

Hp Elite 840 Drivers