After struggling with random freeze and random color problem with my computer for 2 years.
I bought new graphics card hoping that it will solve the problem.
I bought geforce-gtx-750 from www.galax.net for about USD 150.
Now computer freeze and noting happens ( No random colors as graphics card is in between) and then autoshuts down after sometime.
I have replaced almost all the components one by one and tested.
Tested with new RAM
Installed New CPU Fan
Tested with HDMI Monitor, VGA Monitor
Tested with/without web cam, speakers, cd-dvd-rom
Only component remaining are Processor (Processor Intel 3.4 GHz LGA 1155)and Mobo.
Now I am 100% sure its Motherboard problem. ( And remember this is replacement mobo, I faced same problem with ASRock Z77 Extreme 3 TWICE)
Now I am thinking of buying new mobo.
Any suggestions I am thinking of intel mobo