Lightroom 4 is blank and won't open catalog

Hello, I am a new in this comunnity. I have been using Lightroom 4 for the past year on my Mac but I did not use it for the past month. Yesterday when I tried to open it again, it opens but it is blank, no thumbnails or anything.It does not allow me to change modules. and when I go to "open catalog" and click on the folder my lightroom just quickly blicks but it continues to be blank. I read some forums on here and I deleted the .lock folder that was underneath my catalog in the finder, but nothing changed.
I did not find this problem that I am descibing in any forum, any help would be greatly appreciated. I am not very tech savvy, I wasn't even the one that installed lightroom on my computer so please bare with me
thank you in advance

Have you tried to Reset the iPod -
Toggle the HOLD switch, make sure you don't see any red at the switch.
Press Menu and Center button for about 10 secs till the Apple logo comes ON, then select your prefered language.
If you are on Mac, then the problem is not iPod resource hogging by the Antivirus.
Yours is most probably hardware due to a dying iPod Hardisk or Battery.
Battery
On standalone, (not using the iPod docking station) how long does the battrey last? Should be 36 hours on full charge, when new, but if it has been on the Docking station for 2 years, the battery would be at its max recharge cycle, and would last a few hours only or less.
Hardisk
Here is a link on doing disk diagnostic posted by tt2.
https://discussions.apple.com/thread/2362776?start=0&tstart=0
For hardware issues like battery or hardisk, the community can't help you, so you got to bring it in to Apple or 3rd Party vendor for hardware replacement.
Have a nice day!

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Lightroom 4 is blank and won't open catalog

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