PC sometime not switching on

[Jintu Das]

I have made a desktop myself taking help from tomshare hardware,preiously.
I have A PC config:
Intel i5 4440
Seagate Barracuda 1TB Desktop SATA Internal Hard Drive
Corsair Vengeance 8GB DDR3 Memory Kit (CMZ8GX3M1A1600C10)
Corsair VS Series VS450 - 450 Watt SMPS
Intel DB85FL 4th Generation Motherboard
Display😀ELL S2240L 21.5 IN LED
I am running windows 7
Everythings works normally, but sometime the PC doesnt starts,the smps fan is running.
Power goes to the motherboard by seeing the light in the motherboard,i debugged that.
and i have checked for bad sectors in the HDD,none found.
Display is not coming,not even the BIOS screen,all wires are tightly connected
can you tell me a way to debug it?
Please Help.
and tell me if u want to know more info about something.

 

[Dark Lord of Tech]

Corsair VS Series VS450 could be the culprit.

It's very poor and not Haswell compatible.

Corsair explains here.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

While we are still working with Intel on the details of the testing methodology they use to check PSUs for Haswell compatibility, it is already known that a power supply that uses DC to DC for the non-primary rails (the +3.3V and +5V) will not have an issue with the new low power sleep states. This is because a DC to DC buck converter is used to convert +12V to +3.3V and +5V. This means that no matter what load the CPU puts on the power supply, there will always be a load on the +12V because the +12V is required to provide power to +3.3V and +5V.

Corsair utilizes this DC to DC technology in most of their power supplies. Starting with the CX750 and CX750M and moving all of the way through the GS Series, TX and TX-M Series, the HX Series, both the AX Series Gold and AX Series Platinum, and the new AXi Series. So whatever your budget, if you choose Intel's new Haswell processor and wish to utilize the new, low power C7 sleep state, Corsair has a power supply for you.

 

[Jintu Das]

I currently have corsair V450 in my system,is there any way to check is corsair the main culprit or something else gone haywire.
And if corsair is the culprit what is the solution you would recommend, to get my PC working perfectly?