I have a 17" monitor, no model, it came with a Time machine. I sometimes get a strange shimmer of the screen and then the power light changes colour, as if it is gone to standby mode. There is then a hissing noise that comes out of the speakers.Usually the monitor comes back on but lately when it comes back on I get a strange barrel shape on the screen with multi colours. The only way to remove it is to switch the monitor off for a few seconds then switch it back on. I have just changed the graphics card, for another reason and hoped this would cure it, it did not. I think the monitor has had it but would like to have your views first before I buy a new monitor. Thank you.
Fruit Bat /\0/Thank you for your reply, I have no mobile or other wireless equipment near the monitor. In fact the layout of pc and surround has not changed for a few years and this problem only started a couple of weeks a go. I do have a degauss button and have tried it often but the probem still returns.