No Signal No Keyboard No Post - Swapped the motherboard -----

Hello,

I have a dell T1500 - 1t Dual Hard drives with Raid configuration. PC is used daily. It was acting a little funny -- screen went white - hard reboot - started fine - then white again -

Now -- no power to the monitor - no post - no signal to the keyboard -
After reading many posted about the unplug and hold the power button, didn't work- used the monitor and wire on another PC - worked on them so that is not it - PC has the upgrade Video card so I plugged it into the one attached to the mother board - no change - swapped all the ram - no change - removed the Graphics card - got the 6 beeps -

So I bought a new mother board -- swapped it out - (not the processor that is original)

Same issues I am running low on what this is - Windows 7 Yes x64bit

What else could I do before It finds its way to the trash....