No standby light on Dbox2 and changed internal fuse on board

[UKd-box]

Hi

Recently my brother in a panic pulled the NOKIA dbox mains plug quickly out because of service provider warning message appeared on TV screen.

When he plugged the dbox back into the mains power, no green lights on front display or LCD.

We have changed plug fuse and internal fuse on the board (red fuse), however still no power light on front display.

There appears to be power going to components on the board, as we used a power tester.

What else could be the problem?

many thanks