Graham suggestion is one of the solutions. But my preference is goning to reporting workspace and seletc the reports which i want. Most of the time , Microsoft generic report Library fullfill my reporting need. The following are common reports which i used
in daily SCOM support
1) Alert logging latency: showing the Latenecy for alerts pick up by agent and written to the database for object instance as an input.
2) Alerts: showing selected objects alerts raised during the selected report duration and for given filter parameter
3) availability: showing objects in state as the monitors that roll up within the report duration
4) configurations Changes: showing the discovery value change for selected objects
5) custom configuration: showing the configuration data for selected object instance
6) Health: showing selected object instance health state
7) Most common alerts: showing most common alerts raised by the selected objects during report period
8) Overrides: showing the override apply to a particular MP or stored in particular MP
9) Performance : showing selected object performance counter during report period in summary
10) Performance Detail: showing selected object performance counter during report period and user can drill down the detail
11) Performance Top Instances: list the top n instance of selected performance rule
12) Performance Top Objects: list the top n object of selected performance rule
Also my experience show me that , user usually select computer object for performance report and blank report is shown. for displaying Windows OS performance, you should select Windows OS object instance as an selected object.
Roger