I have run across this several times over the years.
It usually turns out to be something incompatable with something else on the motherboard. Incorrect connections on the mohterboard.
Some external connection issue.
Has anyone experienced anything else to look for

Hi ka,

Are you saying you have a problem and are getting no POST or monitor activity and you're after some tips as to why?

yes, i run into this every onece in a while

Howdy ka_mcginnis,
There can a whole truckload of reason's lol.
I would start with the power supply. Check all conections. Maybe jiggle your monitor cord a little. Take out your video card and blow some compressed air in all the PCI AGP etc slots. Maybe going into your BIOS and setting it to defaults. Thats just to get started.