You might have to change some of the settings in Skype since the latter can't pick up your webcam. In Skype, head to the menu and click on Tools > Options > General (tab) > Video Settings (tab). Adjust the settings there. If Skype can't find your webcam, then your webcam might be disabled.
If your webcam is disabled, please indicate so and I can provide more instructions for going into your BIOS (which you must do with lots of precautions so I won't go into detail here). I have been able to re-enable the webcams in my EEE PC netbook and another HP laptop adjusting the BIOS.
Sometimes and I don't know why, the BIOS forgets the webcam. Start by shutting down your machine. After it is completely down, push the power button and immediately start TAPPING the F2 button (or whatever button it says on the screen go to into Setup or BIOS; the key to press can be ESC or F3, F8, F10, or F12 depending on your computer model). This will put you into the BIOS (which should be a bluish screen with black text). Right arrow to the advanced tab and then down arrow to onboard components (or HARDWARE or PERIPHERALS.) I believe you will have to hit enter to see the components. Look at the list of components (there might be ones that say card reader, USB ports, Bluetooth if you have it, and most importantly, webcam). All should say enabled. If any say disabled, arrow down to that and hit enter. That will bring up enable or disable. Arrow to enable and hit enter. Hit F10 to save changes and start the reboot. Your webcam should now be recognized."
This is how I was able to get my webcam working again. Did it work for you?