'Horizontal Hold' fault on my Logik LDVR78 DVD Recorder?

I have an LDVR78 Logik DVD Recorder which I moved for cleaning. When I put it back in its original position the picture was slanted horizontally. I've tried removing and refitting the connection cables, but the fault is still there. Is there a way of correcting this fault without resorting to a technician?

Mrs Barbara de Nicola
August 2010