I cannot enter time machine to retrieve an earlier version of a file
I am trying to recover an earlier version of a file from the Time Machine back up on an external hard drive connected by USB to a MacMini server running Snow Leopard Server, but can't get the star field and time bar to come up. I am accessing the server through screen sharing. All I get every time I click on Enter Time Machine I just get another Finder window with the shared items visible on the network greyed out.
If I look at what is on the back up drive using the Finder I can see the TM back ups are there as they should be, so I should be able to access them but I can't.
Looking at the solutions on the Discussion forum I have done most of the things suggested by others with similar sounding issues but without any success. I have removed <com.apple.TimeMachine.plist> and deleted as suggested. I have repaired the External Drive Back up disk using Disk Utility. What else might I try?
Urgent help will be appreciated, please.
Mac mini, Mac OS X (10.6.8), Running OSX Server 10.6.8