since upgrading to 10.9.4 dvds will not load
After upgrading to OS X 10.9.4 onto my 2011 iMac, I tried to load a DVD. It whirled around and then got stuck. It took me about 3 hrs to finally get it unstuck. Now it will not accept DVD's at all, just whirls them around and pops them out. CD's it will take. I then upgraded the software for 10.9.4 and tried again. nothing. I want to install Photoshop and can't get the install disc to run. I'd appreciate some ideas. Nanci