I assume this is the My Virgin Media app and not the TV GO app, so when you click on status you get green ticks for broadband and phone and not for the TV, does it tell you what the problem might be.
Before you turn the box on is the led red, and when you turn the box on can you watch live TV so it's just the white light that is off.
When you have the TV turned on does the status still say you have a problem.
Can you check what the box power setting is, press the Home button and go to Settings (cog on the right) > System > Standby power consumption.
You have 3 choices, Fast start, Active start, and Eco start, if it's set to Eco start set it to Fast Start or Active Start.