Hi I just read your post, I'm having a similar problem, only difference is that in my case when my PC begins its boot process, it first sounds two (2) beeps and then nothing more happens. Even the initial information like Ram info, Memory etc., none of that shows up, the monitor simply remains BLACK.
I find it interesting that you finally found a way to get it started by unplugging and plugging back in.
Can you detail for me exactly what you unplugged and plugged back in, so I can try this out too.
Thanks... VB