ASRock B250M PRO4 issue

[pandamonium2112]

I just put together a budget built for my girlfriend using old and new parts.
Parts were picked from PC Parts Picker and showed no conflicts.
Specs: New
ASRock B250M pro4 micro ATX
Intel Pentium G4600 LGA 1151 3.6GHZ
2 sticks of EVO Potenza 4GB 2133 DDR4 Ram
EVGA 430W power supply

Old:
(3 week old) Gigabyte GeForce 210 graphics card
Generic DVD RW optical drive
WD 500 GB sata HDD (for os)
Seagate 250 GB sata HDD (for storage)
HP Pro 3000 MT case
Authentic Windows 7 Home Pro

Install went flawless. All the parts fit perfect.
With CPU, Ram, optical drive installed, PS/2 mouse, keyboard and power switch plugged in, I fired it up and accessed the BIOS. Everything registered fine. Power off, plug in WD 500 and installed OS with no problem. Installed all drivers and utilities. Hooked up Ethernet and installed all updates. Power off, installed graphics card, second hdd and front panel usb plug. Installed graphics drivers and utilities and updated windows till no update could be found, device manager was free of issues.
Machine had been running perfect for over 5 hours with no glitches anywhere. Bios showed processor was running under 30 degrees F. Only thing not done was a defrag on the hdd. I got a call and had to go to work (12:30 am) so girlfriend sat down and started playing Windows Spider Solitare with instructions to defrag before she went to bed. Within 15 min the computer locked up. No mouse or keyboard function only frozen graphics. She didn't dare shut it down and I cant be reached while working so she shut off the monitor and left it as is till I got to it 12 hours later.
I turned on the monitor and found a black screen, couldn't get a video signal out of the comp. Tried onboard graphics and got nothing. I hooked up a known working monitor to both ports and still nothing. Unplugged the graphics card using onboard still nothing, unplugged hdds and tried to get to bios with no luck.
Power supply is running and there is power to the board and all devices (checked with meter) this machine just died!
I'm stumped on where to go next with this rig.
Thanks in advance for any useful input to solving this issue.

Update:
So far: I have pulled the VGA card. No change. Unplugged the HDD's and reset CMOS. No change. Reseated the CPU and Ram, have MOBO stripped down to initial BIOS mode but the monitor comes on saying "No Signal" How do I determine whether it's the MOBO or CPU?

 

[rocktalkrock]

Is the ram in it's proper "A1 + B1" or "A2 + B2" configuration?
Have you tried booting with 1 stick? I'm not sure if that will work but you can try.

 

[pandamonium2112]

Yes, Ram is in A1+B1 configuration, Bios had them both listed in the correct slots and running at 2133 all the way to failure. I tried pulling them one at a time and from different slots, even tried with both out. I believe you are correct also, it should work in different configs (A1+B1) (A2+B2) or solo A1, B1, A2, B2 with max capacity of 64 GB. Everything I have read so far is leading to MOBO having failed. I just cant figure why it ran so perfectly with flawless install only to fail on a Windows Spider Solitaire game.. That's electronics though.
All parts were purchased from Newegg.

 

[rocktalkrock]

Have you pulled the motherboard out of the case, to check for any stand-offs that are out of place?

Also a suggestion for when you get it working, don't bother adding the GeForce 210 card. The built in GPU on the Pentium G4600 is far more powerful.

http://gpu.userbenchmark.com/Compare/Nvidia-GeForce-210-vs-Intel-HD-630-Desktop-Kaby-Lake/m7740vsm178724

 

[pandamonium2112]

yes I did check the stand offs and all was well. My buddy came by (more background than me) and looked the system over. His diagnosis was bad MOBO. Be doing an RMA tomorrow. The graphics card is kind of a different story, its only 2 week old purchase and I figured it was dumbing down the graphics but installed it just to remove that process from the CPU.