Drayton Digistat 2 Blank Screen?

Hi

Last week I posted a question about resolving a problem I was having with my Worcester 24i boiler. I had bled the radiators and taken all the pressure out of the system.

Since then I have had a guy out to service the boiler who showed me how to get the pressure back up.

Bizarrely, I came in last night and went to put on my heating only to find that the screen on my Drayton Digistat 2 was completely blank. I removed it from the wall and changed the batteries but the screen is still blank.

Can anyone suggest what might be going on here and are the two events linked or is it just coincidence? Perhaps it's just that the screen is quite old and has "gone" now?

Thanks
Graham