Power Mgmt Report not working?

Power Mgmt Report not working?

Hi There, 

I have been trying to view overall uptime of PCs, the overall time users have spent logged into a device and how often a device is restarted by the user. 

While looking for the best way to view this information I was looking at the "Power mgmt" report. No matter what settings I change and run the report. Nothing ever seems to load? 

Is there a problem with this? 

                  New to ADSelfService Plus?