You can see when the Server was last rebooted by running a single script.
exec master..xp_cmdshell ‘systeminfo’
If you find an error; then you may need to enable this through sp_configure in which case you can run the following:
exec sp_configure ‘show advanced options’, ‘1’; reconfigure; sp_configure ‘xp_cmdshell’, ‘1’; reconfigure;
Your output should be similar to this. Additionally; you’ll see ALL the OS System Information