You may just need to completely clean your motherboard. This exact same thing was happening to me; complete freeze; complete hang, with nothing in any logs, no response to mouse or keyboard, just a frozen screen and a hung CPU, completey unresponsive. Logs showed nothing.
I did a complete cleaning, which included taking out motherboard, disconnecting everything. Very, very careful cleaning. Taking off the CPU heat sink which was attached to the internal fan meant I had to re-seat the surface of the heat sink to the top of the CPU, using thermal paste, artic silver 5, I purchased at my local radio shack.
I also used pure rubbing alcohol (91%) to clean the old thermal paste off the cpu and heat sink.
I had downloaded instructions from both intel and artic silver.
It has to be very, very clean, there are very specific instructions.
Put it all baack together, per the instructions I downloaded, ran fine.
Saved me from throwing out the PC, thinking something was physically wrong with it, when it was just dirty and dusty. Underneath the fan shroud it was really a gunky mess on the motherboard. This must have been causing some short-circuiting, as dust and dirt/gunk is electrically conductive.