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Okay. I just solved this issue:
Laptop with built-in camera running Windows 7, no Imaging Devices in Hardware Manager.
Specifically, HP Pavilion dv7-6b56nr with HP TrueVision HD, Neither YouCam nor Facebook IM are working.
Original Problem:
The system was delivered with the symptom: The camera used to work but it hasn't been working for months.
Findings:
I checked the Computer>Properties>Device Manager to find Imaging Devices>... but there was no Imaging Devices.
When I tried to use Cyberlink YouCam, I was presented with the error: "No webcam detected. Try plugin in a webcam into your computer now. If you are using an integrated webcam , make sure that is turned ON"
I looked all over to see if there was some kind of camera on/off switch - a nice feature if I had found it, much like the wifi on/off - but I could not find such a feature anywhere.
I thought maybe it was because Facebook was installed over YouCam and HP Specifically warns about multiple apps accessing the camera.
So, finally, I booted with Puppy Linux 5.1 to find that it too could not find the built-in web camera.
I decided this was a hardware issue, maybe one of the cables was pinched and broken...
Results:
I found that the connection to the Web Camera within the bezel surrounding the monitor was ajar (slighty pulled out of place).
I simply push the connector back into its socket and everything is back to as it should be:
Computer>Properties>Device Manager>Imaging Devices now contains HP TrueVision HD.
Procedure for checking the camera cable:
I did Part I first but you might be able to just do Part II to access around the display.
Part I: Check the cable at the motherboard.
1. Remove the battery.
2. Remove the memory/HD/access cover (using the battery slider to start).
3. Remove 4 long black 2.5mm screws at the four far corners of the laptop.
4. Remove 9 short black 2.5mm screws (you do not need to remove the 8 more which hold the hard drives in place.)
5. Remove the CD Player.
6. Remove the 8 very short silver 2.5mm screws.
7. Remove the keyboard by prying starting along the top edge, you might start by pushing through from the bottom of the laptop.
8. Disconnect the keyboard by lifting the hold-down on the connecter on the motherboard.
8. Remove 2 more short black 2.5 mm screws which were under the keyboard.
9. Disconnect the 4 visible connections from the motherboard in a similar fashion as you did the keyboard.
10. Remove the keyboard bezel (which includes the power button, trackpad, and fingerprint reader) by snapping it apart is a similiar fashion as the keyboard, be careful not to break the plastic pieces.
11. Remove the one more connection which connects to the front USB board.
Good. Now you can check that the camera cable is properly connected to the motherboard - it is the 6-wire cable wraped along with the video cable.
12. You may snap out the speaker that is between the keyboard and the monitor to get a better view of the cables as they enter the hinge.
Part II: Check the cable at the camera.
1. Remove the two sticker-covers hiding two short black 2.5mm screws, remove the two screws.
2. Snap off the bezel around the monitor, be careful as the grey-plastic hinge covers are (kind-of) rivited to the black bezel, also be careful not to break the plastic or snap the bezel in half.
Perfect. Now you can check that the cable is properly fitted into the camera board. This was the issue for me.
Part III: Testing
1. Reconnect the three connectors for the keyboard bezel (don't worry about the front usb board for testing).
2. No need to resnap the bezel in place for testing..
3. Reconnect the keyboard connector, again no need to resnap for
4. Plug in the power, power up
5. Goto Computer>Properties>Device Manager>Imaging Devices... Success?
6. Double check with you webcam software.
7. If everything works put it back together but double check once or twice along the way, assuming the the connector might fall out or there might be some short that the covers are causing...
Part IV: Not for me because I didn't need to go this far.
If both connectors appear properly seated and the camera still does not work, maybe the cable is broken: If you happen to have another cable just sitting around, use that..... 
