I would try the monitor on a different computer. Did you change refresh rates or display settings before this happened. I've seen this happen if you set windows to use a refresh rate or screen size that the monitor can't handle. If it works fine on another computer, try hitting F8 on start up to get into safe mode and change your display settings to the lowest they'll go and restart. Or borrow someone elses monitor and try to get into windows. If so then lower the settings and try again. Unless you are good with electronics testing, I wouldn't take the monitor apart. Take it to a shop to get looked at. They can give you a nasty shock if you poke around at the wrong things.

 

did those things you suggested.....

i did those things you suggested, i put the monitor onto my other system and same thing it wont work. i plugged my other monitor into the other machine and reduced the refresh rate down to 60 (its the lowest it will go) and then dropped the res down to 800x600. plugged the monitor back in....and it worked. it booted to windows and last bout 5mins then just went blank, the led was green, to say it was on, but no picture.
i dont want to spend the money and buy another on, i can tell ya.

 

Well you could take it in to a shop an get an estimate to fix it, but 15" crt monitors not very expensive. A new one might be less expensive than repairing your old one. A cheaper way would be to go on e-bay and find a kvm switch and share the one good monitor you have between the two systems. Fixing it yourself is unadvisable unless you really know what you are doing.