Hello, I'm working on a Dimension 3100 that won't POST. When you plug it in, there is an amber LED that lights up on the motherboard, but nothing happens when you push the power button. I ordered a new(refurbished) motherboard from Dell, and still had the same problem. So I ordered a new power switch board assembly and ribbon cable. Still nothing when I push the power button. I then put in a new power supply, still nothing when I push the power button. I changed the processor with another one I had laying around(Pentium4 3Ghz, socket 775, 533FSB) and still can't get anything out of it. Does anyone here have any ideas?
You say, "still nothing when I push the power button", so does that mean the power supply fan spins up and you do get a solid amber power light?
I am also having a similar problem. I tested the power supply by jumping out power and the fan turns on, however, the only response I get from the desktop when plugged back in a yellow light near the battery on the motherboard. The machine is completely unresponsive. Have tried blowing out the power switches and looking for loose connections in the cable, but get nothing.
I would assume this has something to do with the power switch since this is the only point of failure from wear and tear. Is there a way to jump it out to be sure that is indeed the problem?