Not recognising USB card reader and also PhotoBooth issue

Hi,
I'm a new member and a bit of a numpty when it comes to Mac (new owner).
My Macbook Pro is giving me some grief tonight and I have 2 separate (i think) issues.
It will not recognise my USB card reader. It worked fine last week and I did eject it properly before removing it. I've tried the card reader on a PC and it is working fine....
Also when I go to open Photo Booth it tells me that my camera is not connected or in use by another program. But as you know the camera is built in!?!?!
I'd be very grateful for any thoughts on how I might fix the problems. The nearest Mac store is 2 hours away....
Many thanks in advance

bigredpaws, welcome to Apple Discussions.
Look at
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

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