Re-enable automatically-disabled dashboards
If a dashboard is not viewed for 14 days (or a customized period of inactivity), data collection for the dashboard is automatically disabled to conserve system resources. The disabled status is displayed with the name of the dashboard on the Home > Dashboards page. When you choose a disabled dashboard from the list, the dashboard displays an "Enable collection of data" link. Click the link to resume collecting data for display on the dashboard.
To re-enable several dashboards that have been automatically disabled, it may be faster to choose the Manage Dashboards option from the Dashboards Options menu. There you can toggle entries in the Collect Data column between Disabled and Enabled.
You can enable any dashboard you have access to: Public, Shared with you, or Private (owned by you). You can disable only dashboards that you own.
You can change the inactivity period from the default value of 14 days.
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for individual dashboards (Manage Dashboards) more
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for all dashboards (Administration > General Settings > Dashboard Management) more
Getting started with dashboards