Usb port/sd card reader recgonition issues after Yosemite?

I recently downloaded Yosemite to my macbook pro and hadn't noticed any issues till I tried to upload some photos. I usually just use the sd card reader but quickly found that each time I put an sd card in (I tried several just to make sure it wasn't an issue with my cards), there was no recognition at all, not in the left hand sidebar in the finder window or in the disk utility. I next tried out the usb ports with my ipod, external hard drive, and camera's usb cord. The first usb port is recognized in both itunes (when my ipod is connected) and in the disk utility (still not in the left hand sidebar finder window where I could just click on the device and see the contents it held like it usually has done in the past) however when I connect anything to the second usb port, I can hear the external harddrive revv up and my ipod starts to charge, but it isn't recognized in the computer by itunes or in disk utility. I'm not sure what to do since I did not back up my previous drive before updating my software and am a photographer who relies on being able to upload my photos on my computer. All my ports were working just fine before I updated this past week so I'm wondering if it has something to do with Yosemite?
I've made sure my external disk's option was checked in >finder>preferences, tried to reinstall yosemite, and have reset my PRAM and SMC and unfortunately found no difference.

I had this problem and don't at moment. Not sure of cause. Some have found that cleaning slot with compressed air or contact cleaner helps. Search Yosemine (this) forum for post headed "SD card reader does not work anymore" by GabTH (11/2/14) for a software fix. (Sorry, not a frequent user anymore and can't easily paste a link.)

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