On the key that have come off, you'll need to replace the entire keyboard, that is if you are not able to insert it back...
On the keys not practical, that looks like keyboard problem, but we have the ability to check in BIOS moreover . In BIOS go to Security, highlight Admin password and press enter, now try and oral exam the keys there, if it doesn't work there as well than we have confirmed upright put out....
Source: http://h30434.www3.hp.com/t5/Notebook-Hardware/HP-Pavillion-dv7-Keys-Not-Working/m-p/318353#M32569
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