PCM Screen issues.

[sticks090460]

Couple of days ago, when starting up my 57 plate 997 Turbo, screen on the PCM was blank. Switched off then on, came back fine. Then today top half inch was flickering for about 20 minutes, then went blank completely. CD player works ok, finished journey by using arrow display in the instrument cluster.
Any ideas on likely cause, and/ or a fix other then taking to dealer?

Thanks.

[sticks090460]

Thanks chaps. This morning it's all back to being fine and dandy (???!!) - I'll keep it under review and your suggestions on file!