Probably of no great interest but perhaps may prevent some people head scratching over a monitor fault.
I have been using a Compaq TFT Monitor quite happily for about 9 months now (originally bought off eBay) on the end of my nVidia MX420 and W98SE system. About a month ago I upped the screen resolution from 800x600 to 1024x768 with no ill effects.
I came home wednesday evening to find the display extremely blurred and fuzzy. The effect was almost as if it were being affected by electrical interference. I switched the monitor off and on, rebooted the PC, re-installed the nVidia software and reseated the card (not all at the same time) all to no effect.
Reducing the resolution back to 800x600 cured the problem, but every time I reset the resolution to 1024x768 the problem returned and definitely seemed to be being affected by HDD activity (when the HD was busy the distortion was worse, when the HD was quiet, the distortion was reduced although still bad).
With fingers crossed I nipped out and bought a new SVGA cable and cheapo graphics card (MX4000).
As soon as I replaced the video cable the problem disappeared !!!
Anyone had this before ? How can a cable 'go faulty' just like that, but not enough to disable the monitor entirely ? I suppose an earth lead protecting the cable from RF or other stray interferences must have become detatched or making poor contact or something.