New computer turns on for 1 second and turns off

I've had this computer for about a month or two. These problems have popped up occasionally before, but I've fixed then by waiting a few seconds and restarting. Sometimes, my computer turns on for 1 second then turns off - and sometimes it turns on for 5 seconds, beeps, then turns off.
This time, It's not turning has turned on for 1 second then turned off the whole day!
I was eating dinner while my computer was still on, then when I came back, the computer was off.

When I press the power button, the power light blinks for 1 second, the System Fans(2) turn on for 1 second, the Graphics card fan turns on for 1 second, and the Cpu fan turns on for 1 second - then powers off. There is NO burnt smell or anything weird that I physically see.

Windows 7
i5-2500k @ 3.3GHz
Hyper 212+ CPU Fan
Asus nVidia GTX 560 Ti
Gigabyte P67A UD3-B3
Corsair 600 PSU
8GB G.Skill Ram

I've tried each stick of RAM, replugged everything in... and nothing worked.
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  1. My standard troubleshooting reply seems appropriate.

    Work systematically through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

    If not, continue.
    The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

    I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

    Breadboard - that will help isolate any kind of case problem you might have.

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

    Make sure you plug the CPU power cable in. The system will not boot without it.

    I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

    You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

    If no beeps:
    Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

    At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

    This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

    If the system beeps:
    If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

    Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

    Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
    At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

    Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
  2. I tested my power supply with a paper clip, and the PSU's fan span for about 3 seconds then the fan stopped. Does it still mean that my power supply is dead?
    My PSU is Corsair CX600. Is there still a warranty? I've bought these parts about 2 months ago at most. And also, if I ship it do I need to pay money for it - and how much?
  3. Did you leave the paperclip in place or just momentarily short the green to black wires?

    Remember, when you press and hold the power switch, after a few seconds, the PSU shuts off.
  4. I tested it multiple times and the fan rotated for like 3 seconds and stopped.
    I left the paperclip in place and the paperclip was still in and the fan stops working.
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