Seemingly random blackscreen crashes when opening programs

[ShiftKitt]

My computer crashes to a black screen with 'no display input' when opening programs. Sometimes happening with the first program post-start, sometimes after 12+ hours of successful computing. This started happening about 3 months ago, with no hardware or software changes. This computer is used for work, school, and gaming.
What I've tried:

Formatting and reinstalling Windows on my SSD
Installing Windows on a spare HDD
Uninstalling and trying older graphics drivers
Using a friend's graphics card in place of mine
Removing optional peripherals and optical drives (problem in the past)
Resetting overclocks to factory settings
Cleaning all electrical contacts and ensuring good solid contact in each
Running Memtest for 12+ hours
Removing sound card
Ensuring Windows is completely up to date

Build:

CPU: i5-3570k
Cooler: Cooler Master Hyper N520
MOBO: Asus P8Z77-V
RAM: Corsair Vengeance 2x4GB DDR3 1600 (9-9-9-24) CAS: 9
Graphics: Asus GTX 770 DCUII 4GB
SSD: Samsung 840 Evo 256GB SSD
HDD: Western Digital Caviar Black 500GB HDD
PSU: Corsair TX 650
Display: Asus VG248QE
Case: Cooler Master Storm Scout II (why not eh?)
OS: Windows 7 Home Premium

I don't pretend to know everything about computers, so any ideas or tips are welcome.

 

[vtec33]

Check event viewer in windows to see if there are any errors that may have come up at the time of crash

 

[ShiftKitt]

Check event viewer in windows to see if there are any errors that may have come up at the time of crash

No errors have come up in the event viewer.