Hi @William121 ,
The router should change to a solid white light as soon as your line is switched over to fibre, TalkTalk always say that it can take until midnight for everything to happen, so would be worth leaving it until after midnight.
If it is still flashing in the morning then try switching the router off for over 30 minutes and then switching it back on.
The staff on this forum won't be around until Monday now, so you may get faster support tomorrow by using the live chat or phoning up, however the staff on this forum will be able to help next week if you are still having problems.
I'm showing a connection currently, is all ok now ?
Please log in to My Account if you need to view or pay your bill, manage boosts and track your usage. From My Account you can also check your connection and test your line for any issues in the Service Centre.
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I'm sorry to hear this.
I've completed a further line test which hasn't detected any faults.
Have you tested with the phone directly at the test socket, with the router removed from the line? Was the no dial tone fault still present in this set up?