Monitor won’t “start”

I have Futura 17″ monitor about 2 years old operating on win98 platform with iWill VD133 motherboard, 384mb memory and Kaser sis305 video card. Recently the monitor displays “Check signal cable” upon startup of the computer. It wont even display the bios startup. If I shut computer off and right back on before fans etc. stop completely the monitor will begin working. This may take as many as a dozen restarts before it works. I have checked windows settings etc. bios settings and even tried another video card. Nothing fixes this problem. (I have yet to try another monitor on the machine, or try monitor on another machine)
Anybody have any ides?