newly built system, but nothing shows on monitor!

[dippmaster]

I've been slowly building a new desktop, now its complete and i turn it on the monitor doesn't get a signal. here are the specs:
MSI K9ND Speedster
2 AMD Operton 64 duelcore  2214
4GB DDR2 667 ( 2GB for each processor)
PNY Geforce 8600 GT 256MB
nForce Professional 3600 MCP
HP w17e 17" widescreen

i don't believe it to be a faulty mobo or video card, as far as i can tell its going through POST or atl east the keyboard leds light up on start uplike they would in POST. and i also tried a PNY Geforce 8800 card and got the same result. the 8800 needed extra power from PS, the 8600 does not. also the montor works perfectly fine as a secondary screen for my laptop.
please let me know if you have any thoughts.

[Calum]

Have you tried another monitor on that machine?

[GX1_Man]

You listed everything except the power suply make, model, wattage and age. 

[ale52]

Have you tried using only one processor and one stick of RAM?

Alan <>< 

[dippmaster]

ok well the PS is a CoolerMaster 750 Watt brand new. i tried a dif monitor but still got same result. i just tried one processor and 1 stick of ram and nothing changed

[ale52]

If you've swapped and used both CPU's and RAM sticks with the same result it could be the motherboard or power supply.  Easiest thing to swap is the power supply.

Alan <>< 

[honvetops]

when something similiar happened to me on my last build it was a loose wire*
 go back "grounded"  and painstakingly  double check your case to mobo wires.

 Check all the connections...AGAIN... especially if using  sata connections

video card / ram / cpu & heatsink  seated firmly / connections from it to monitor?

 its going to be something  stupid...      good luck