do i need to hold the button while it is booting or when i am at the triangle with the exclamation point in it?

So i recently installed GTV 2.0 on my Logitech Revue. I must say. I like the new layout, but was disappointed that Netflix did not work on it. After messing around with it the device will boot to an exclamation point and go no further. What I would like to do now is reinstall the factory ROM much li...