Hi, i have been facing some issues with my rig. 
the problem is after installing windows 8 or windows 10 the pc freeze either at start up or at a random time after login. Mouse keyboard stop responding and the HDD bulb is constantly lit without blinking as it should be. I have to restart to use the pc again.However this problem does not occur with windows 7, I dont know why this is. As remedies I've tried ;

1) unplugging rams,cpu,graphics card,network card and putting them back
2) Monitored my rig's temperature while running "stress my pc" and "intel burn test", the temperatures never went above 74 Celsius and the pc did not crash during any test
3) Tried resetting ram voltages from 1.5V to 1.25V . And setting ram timing on both slots to 9-9-9 -24 
4) Tried flashing bios to the latest bios for the board , F8 bios 
with all motherboard drivers 
5) Did a complete format and tried installing windows 8 , 8.1 and windows 10 separately. Non of them worked

my Rig details are 

Processor: Intel(R) Core(TM) i3-4130 CPU @ 3.40GHz (4 CPUs)
Ram : RipJaws 4G x2 , 1600Mhz , 1.25V , ram timing 9-9-9-24
Motherboard : G1 sniper B5 
Graphics card : msi GTX750Ti 2G 
BIOS: BIOS Date: 07/10/14 13:39:04 Ver: 04.06.05
PowerSupply : 550W 
Monitor : Dell E1910H 1366x768 resolution
Current stable OS : Windows 7 ultimate 64bit

Any suggestions to what the cause might be or any fixes you can come up with will be greatly appreciated

Hi, i have been facing some issues with my rig. 
the problem is after installing windows 8 or windows 10 the pc freeze either at start up or at a random time after login. Mouse keyboard stop responding and the HDD bulb is constantly lit without blinking as it should be. I have to restart to use the pc again.However this problem does not occur with windows 7, I dont know why this is. As remedies I've tried ;

1) unplugging rams,cpu,graphics card,network card and putting them back
2) Monitored my rig's temperature while running "stress my pc" and "intel burn test", the temperatures never went above 74 Celsius and the pc did not crash during any test
3) Tried resetting ram voltages from 1.5V to 1.25V . And setting ram timing on both slots to 9-9-9 -24 
4) Tried flashing bios to the latest bios for the board , F8 bios 
with all motherboard drivers 
5) Did a complete format and tried installing windows 8 , 8.1 and windows 10 separately. Non of them worked

my Rig details are 

Processor: Intel(R) Core(TM) i3-4130 CPU @ 3.40GHz (4 CPUs)
Ram : RipJaws 4G x2 , 1600Mhz , 1.25V , ram timing 9-9-9-24
Motherboard : G1 sniper B5 
Graphics card : msi GTX750Ti 2G 
BIOS: BIOS Date: 07/10/14 13:39:04 Ver: 04.06.05
PowerSupply : 550W 
Monitor : Dell E1910H 1366x768 resolution
Current stable OS : Windows 7 ultimate 64bit

Any suggestions to what the cause might be or any fixes you can come up with will be greatly appreciated

I have the exact same symptoms and have tried the same diagnostics with the hardware and this build was make using windows 8.1 pro initially, upgraded to 10 and now a fully formatted SSD with 'clean' windows 10 install.

My build is -

Processor (CPU)
Name Intel Core i7-4790K CPU @ 4.00GHz
Threading 1 CPU - 4 Cores - 8 Threads
Frequency 4389.52 MHz (44 * 99.76 MHz)
Architecture Haswell (22 nm)
CPUID / Stepping 6.C.3 / 6.3C (C0)
CPU Extensions MMX, SSE, EM64T, VT-x, AES, AVX, AVX2, FMA3
Caches L1 : 128 KB / L2 : 1024 KB / L3 : 8192 KB
Microcode 0x000001C
Max. TDP 88 Watts
Temperature 43C
Voltage 1.23 Volts
Type Stock
Motherboard
Model Shuttle Inc. FH97
BIOS American Megatrends Inc. - 1.04 - 12/22/2014
CPU Socket Socket 1150 LGA
North Bridge Intel Haswell rev 06
South Bridge Intel H97 rev 00
Memory (RAM)
Size 16384 MB
Type DDR3-1330 - Dual Channel
Frequency 665.1 MHz (1:5)
Timings 9-9-9-24
Slot #1 Module Crucial Technology - 8192 MB (10700)
Slot #2 Module Crucial Technology - 8192 MB (10700)
Graphic Card (GPU)
GPU Type NVIDIA GeForce GTX 970 (1367 MHz)
VRAM Size 4095 MB (3505 MHz) Miscellaneous
Windows Version Windows 10 (10.0)
Windows Subver (Build 10240)

All settings are default, and drivers/bios confirmed to be the latest available.  I have examined the event log but can't see what's triggering these repeated crashes.  Please help!

What I would suggest first is to do a Clean Boot of the computer. This will disable all running services other than the needed Microsoft services. Once the computer boots up, you can turn on a couple of known services at a time, then restart the computer. This process of illumination will aid in the troubleshooting to find what may be causing your computer to freeze.

Another suggestion would be to scan your computer for any malware/spyware infections on your computer.