E173FP, 2005, blank

Monitor goes blank almost immediately after switching on. Switching it off, leaving for a few seconds and back on gives the data from the PC sowing but almost immediately goes blank.

Following the suggested checks some years back gives a short flash of white when operating the on/off switch with no power attached. Replacing power and switching on gave the word Genesis for half a second and a blank screen after that.

Switching off and then on again gives the Self Test blocks that disappear almost immediately.

Where would the fault lie and how do I remove the casing - there is no obvious way?