SQL Server 2008 R2 IntelliSense not working

I had the same issue, that intellisense did not work on SQL Server 2008 R2 There might be different reasons.

• One of the reason for this behavior can be a database switched offline. When  switched all databases online, intellisense worked (after i refreshed the local cache if it is caused by this reason).
• Another check you should check if your IntelliSense is enabled in the Query Drop down menu it'll be visible if you open a query window confirm it is enabled.
• You should refresh you local cache from Edit menu then IntelliSense and then click on Refresh Local Cache or shortcut key is Ctrl + Shift + R

if still its not working

• There are some hot-fixes available for this problem like in this link http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2507770&kbln=en-us 

• but personally I don't recommend those they can harm your system as support team say I recommend upgrade your SQL Server R2 to Service Pack 1 see this link http://www.microsoft.com/en-us/download/details.aspx?id=26727 

I hope this'll fix your problem thanks for reading...