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Dell E5450 - blank screnn on external monitor connected to dock station

Hello everyone

I've problem with my dell E5450

1. When i connected laptop with close cover to the dock station i will get screen on the external monitor.

2. When i connected latptop with open cover i've screen on external monitor and on the laptop.

Problem starts when i connected my laptop with close cover to the dock station then open them. 

I've only screen on the laptop but none on external monitor. I must use  keys combination like "windows + p" and choose  extent screens to display screen on laptop and external monitor but when i disconnected laptop from dock station and connect again that the same problem.

What can i do to solve this problem?

My configuration:

intel core i5-5300U 2.3 Ghz

Intel HD 5500

Windows 7 pro

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