PC Freezing No BSOD Only way to fix is to hold Power Button

[ABorland]

PC Keeps Freezing - No BSOD.

I'm at a complete loss as to what is causing my PC troubles. I have had this PC for about a year. I built it myself and originally I was having the same exact problem I am having now. At the exact same time of the year.

How did I solve it the first time? I'm not really sure it ended up with me RMAing a motherboard and installing the new one. The problem is the freezes still happened on the new board! I went to visit family for vacation and I didn't come back until New years day and the problems seemed to have magically gone away!

9 months later the problem is back and I don't know what to do. I have run memtests numerous times. I have taken the RAM physically out and left only a single stick in ti see if it was a individual stick the test wasn't picking up, I've run Hard Drive tests (the last time this happened I lost 2 hard drives trying to figure out what the F was going on.) Both show good.

I updated to the latest and most stable version of my PC's BIOS. And it is still happening! Could it be another rotten Motherboard?

If anyone can help me I'm eternally in your debt. School starts up this week and I do a lot of computer reliant heavy homework. Without it I'm going to be in a world of trouble.


Here are my specs:


Windows 7:

Motherboard: ASUS P8Z77-V LX LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
RAM: Corsair Vengeance Blue 8 GB (2X4 GB) PC3-12800 1600mHz DDR3 240-Pin SDRAM Dual Channel Memory Kit
GPU: EVGA GeForce GTX 660Ti SUPERCLOCKED 2048MB GDDR5 DVI-I, DVI-D, HDMI, DP, SLI Graphics Card
CPU: Intel Core i5-3570K Quad-Core Processor 3.4 GHz 4 Core LGA 1155 - BX80637I53570K
Power Supply: Antec EarthWatts EA-750 Green 750 Watt SLI CrossFire 80 PLUS BRONZE Power Supply

EDIT:

I've added some screenshots of HD stats In case I missed something there:

http://i.imgur.com/Ggbn7WW.png

EDIT 2:
I just remembered that before the problems did start this time around I got the following BSOD: It should be noted that my PC froze on this BSOD as it was 75% done with a dump of data

MACHINE_CHECK_EXCEPTION
STOP 0x0000009c (more hex values here)

There was another BSOD I got a week before this that involved something about the usbport.sys I think

 

[cars12345]

Is the CPU fan spinning? Are all power supply connections secure?

 

[ABorland]

Is the CPU fan spinning? Are all power supply connections secure?

Funny that you ask this. The CPU fan is indeed spinning. However about the time this trouble started up.. The fan began to act up and have issues starting. I just put in an RMA for the fan and should have the replacement tomorrow. ( I tested another CPU fan I had to make sure it wasn't the power supply and it started up fine so it looks like the bearings on this one are starting to go.)

I have been monitoring my CPU temperatures though and they don't go above 55/60 C
Here is a screenshot : http://i.imgur.com/lSpVhkK.png

I haven't fiddled with any power supply connections in the case for months on end before the problem started. When I put the new CPU fan in tomorrow I'll double check and make sure everything is connected firmly just to be sure.