Have you got Security Software? I have McAfee Internet Security Suite and haven;t had any spy ware in my system for ages. Try downloading the HiJackthis Analyzer. It will detect anything in your system that looks suspicious. Be very careful using this as it doesn't differentaite between good and bad things on your PC. Running it on my PC brings up 40 results so you need to know what you are looking for otherwise you could be deleting things that are supposed to be on your computer!!
My Sony E220 17" CRT Monitor 'blinks' from time to time with associated noise, it has been doing that for quite a few months on and off. I have had it since 2000 so would hope it still has a few years yet. Still working as new though!