N68C-GC4FX boot

It turns out that my power supply (600w) could not supply adequate power for the nVidia GTX 560 Ti running two monitors.  During what seemed like endless troubleshooting, I unplugged one of the monitors.  Surprise, the PC is actually fully booted into Windows 10 x64 and waiting for me to enter my PIN.  Plug the second monitor in and no screen output.  What really threw me was the monitor was indicating it had input.  I guess it knew it was connected but the video card did not have enough power to drive the monitors.

I booted into BIOS.  Reset everything to factory default.

Clean W10 x64 install.  Goes through install like a champ.  Finally boots into Windows Desktop but USB mouse won't work.  Shutdown.  Reboot.  Same as before, spinning dots then nothing on screen.

I thought maybe the nVidia card driver isn't happy.  Switched to onboard video.  Same.

@datonyb  Yea, two sticks of 2GB DDR3 in dual channel.  Low RAM for sure but this PC is only going to run a DISH Player in my shop so I can watch TV.  Internet in the shop but no cable.

I was running two 512MB sticks of DDR2 RAM with everything else the same but W10 x32.  Was getting some lag in the video and thought more memory would help and that is what I had lying around.

I built this PC basically out of extra parts except for the MB.  Originally thought I only had DDR2 so that is what I used.  Hard to find AM3/DDR2 boards these days.  Found DDR3 in another hidey hole so swapped it in to get to 2GB.  This should run W10 x64 with ease.

This feels like a video problem as everything is fine until the PC gets to the place where video drivers are normally loaded.  I am going to try another clean install with the internal video chip selected instead of the PCI-E.  Maybe Windows will load a different driver.

AMD Phenom 550 X2

GSkill ECO 2GB DDR3 memory (on QVL)

Asus nVidia GeForce 550 Ti

WD 300GB hard drive

Windows 10 Pro v1704

Load Windows and everything appears to go normally.  Go through setup, enter login info, PC reboots, get the blue windows logo, get the spinning dots, screen blanks, logon screen never appears.

The PC is not locked up.  USB keyboard can toggle numlock on and off, even power down PC.

Not sure how to start trouble shooting.  Everything in BIOS looks ok.   I could load the latest BIOS but not sure that will make things better or worse.  All suggestions appreciated and responded to.