Why doesn't "Preview" open my .PDF files on my computer?

Hello Guys,
My "Preview" program stopped opening .PDF files about a week ago. The program shows up in the dock, but it doesn't display the PDF. It displays JPEG's no problem, but for some reason it' doesnt open PDF fils.It is driving me crazy. I have googled and googled, but no luck in fixing my problem.
I have even set the PDF files to "always open with preview"
Any help would be greatly appreciatd
Thanks in advance
-Miguel

I suspect your problem has to do with the file on the drive that stores the preferences to open what up with what program.
I don't know exactly what that preference file is, but I know of a way to check for corruption of the preference files and once you know which one is corrupted, then we can delete it and it will rebuild.
So do the #12 and #13 OnyX routines here, that will also clear your caches and speed up your machine a little as well.
..Step by Step to fix your Mac
Once #13 is competed then see this Ut here.
Deleting the System Preference or other .plist file

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