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make sure that the dvd rom is getting enough consistent power test all leads that are attached to the dvd rom including electical extensions and make sure they have a secure connection or just replace them there might bebad/faulty or your drivers may have been corrupted or you might have a virus run your antivrus program you might have to physically unplug the leads for this cd rom then plug them back in this will activate found new hardware wizard
The only real solution would be to contact Microsoft and tell them your key isn't working with your brand new computer. They "might" be able to help you or probably just tell you to return the computer or buy a valid copy of Windows in worst case instance.
Your problem doesn't state what driver or device isn't working on your HP compaq 6720s, but all drivers for your laptop can be downloaded from www.hp.com for free. click on the support tab, type in your model number and you can download all of them.!
The replacement panels for the Compaq 6720s range between $85.00 USD and $110.00 USD depending on where you order them from. The replacement is a relatively easy procedure, but I don't recommend it for a first-time novice do-it-yourselfer.
Here are links to some places where you can order the display panel:
Now the good news is you can still use your laptop if you have an external monitor. You can use the appropriate "Fn" key combination to switch your display output to the external device. I believe for the Compaq 6720 is the "Fn" key & the "F4" key. Connect the external monitor then power on your machine, Press the Fn and F4 key simultaneously until you get the display showing on the external device.
One more thing, you will need to go set the laptop to not do anything when the lid is closed. You can do this via Start -> Control Panel -> Power Settings. Change the custom power settings for both "A/C" Power and "Battery Power" to "do nothing" when the lid is closed. By doing so, you can close the laptop lid without shutting off the computer. Of course you will need to add an external mouse and keyboard to continue using the computer, but by following these instructions, you can basically use the laptop, even with a damaged screen, pretty much the same way you would use a desktop. The portability is lost, but the function is retained until you can have a new display panel installed.
Hope this helps FixYa! Please take some time to leave some feedback and a testimonial if you found this information helpful.