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IP address or computer name changed?

You're going to need to install MySQL Workbench and use it to clean out the Server table:

DELETE FROM Server;

...or use MySQL from the command line:

1. Start command prompt (not sure how to do that in W8).

2. Change directory to bin subdirectory of MySQL install location (eg. cd c:\Program Files (x86)\MySQL\bin).

3. mysql -u root -p (then enter your password - MediaPortal ... case sensitive).

4. USE MPTVDBase;

5. DELETE FROM Server;

Now you should be able to get the TV service to start.