SharePoint logs are quite important in many scenarios when we don't find what's wrong in Event Viewer
I was working with SharePoint 2010 environment and saw this, in 14 hive Logs, all logs were of size 0KB
So to solve this,
I checked that Diagnostic Logging was enabled and correct path for logs was set
Then as next step you should check this
For logging, SharePoint uses tracing service named as SharePoint 2010 Tracing (run services.msc)
Check which account this service is using
In my case, I changed service account to local system and logging worked
I hope this helps some one J