unhooked everything and cleaned it? Did you clean inside your case? Maybe you loosened your video card! Make sure your card is seated properly and double check all other connections...it's quite obvious that you've either dislodged a connection or not re-connected properly. (Remember...if your video card isn't working, neither will your monitor!)
I have Windows 98 and my computer is all up-to-date even if it is 6 years old. Worked fine up until I un-hooked everything and cleaned it. Now when I try to start up the monitor won't come on. All the lights (3 of them) are running back and forth, then there's a click and the lights stop. I checked all plugs and the pins.
Anybody have any ideas on this? Any help would be appreciated.