RF Modulator won't work

I just bought a big screen tv, but I am having problems with my RCA digital plus RF Modulator. I have tried to plug it in, and on any outlet that I connect it to… the light blinks once, then goes away. This is the second one that I have tried, and they both do the same thing.

Basically what I am trying to do is play videos from my computer on my tv screen. I have done this before just using an s-video cable, but the tv is about 50 feet away from my computer in another room. So I was going to plug in a modulator and convert it from s-video to coaxial since I already have plenty of coaxial available.

Any suggestions?

Be sure to set your video output prior to hooking up your computer to modulator to TV…
It should be set to 1024 x 768 @ 60 Hz (50 Hz if in Europe) interlaced…
Try that out and get back with the results…