With reference to Tony Willcocks' letter on getting rid of monitor flicker (F!F!F!, July 5), you should be aware that some types of fluorescent lighting can cause a strobe effect which looks like monitor flicker. It can be eliminated by shrouding the top of the screen to prevent the overhead lighting falling directly on the screen.

Barry A Leighton

Information Systems Officer

Manchester Metropolitan University

b.leighton@mmu.ac.uk

I have had two cases of flicker, both caused by poorly shielded electrical equipment close to the rear of the monitor affecting the top of the picture in one case and the whole of the picture in the other case. One was caused by ...