Computer will not boot, only makes a slight beep.

Hello. Just to note, I am a beginner at building computers.
Yesterday, I built a new computer with a mixture of old and new parts.
I replaced my old motherboard, ram, heat sink, and cpu with a
-Asus p8z68-v pro
-Corsair Vengeance 16 GB : 4 x 4 GB Memory - DIMM 240-pin - 1600 MHz ( PC3-12800 )
-Corsair H80
-i7 2600k

other specs:
-gtx 460 sli
-wd caviar black 1tb
-seagate 750gb
-1000w antec true power quatro.
-coolermaster storm sniper case.

Yesterday, it booted up but I had a SMART drive failure (I'm assuming this is because i didn't reformat my old hard drives, or they just suddenly died.)

Now I brought it back home today from a friend's house and it won't boot up. When I try to, nothing will turn on and I only get a beep. I tried again by pressing the power button on the motherboard itself and it still won't boot up.

I am at a loss on what to do. What does the one beep mean? I don't know what could have caused this.
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  1. Can you elaborate on what a slight beep is? Even if you had a hard drive failure your system would still boot. Can you get into the bios at all? check the settings there, see if they changed. if the system was originally set in the bios to have AHCI hdd's it wont boot if you reset the mobo and it reset to load IDE hdds.
  2. Currently, nothing will even turn on. Led's will turn on for a brief second then power off. The fans do not turn on and cant get to the bios. The computer simply won't power up. As for the slight beep, that's the only way I can explain it :\. I removed my graphics cards and it still made the same sound and came from the mother board.
  3. Power supply. if you can, try and find another one to use and test with.
  4. Ahh goodness. I don't have one at hand. Is it possible that it's dead because I tried to get the dust out with an airduster and probably just pushed it inside -_- . Is there anyway I can test it if it's dead?
  5. Best answer
    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:

    Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

    If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

    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.
  6. Thank you for the reply! I will try the whole thing when I get home... I hope this works out. Once again, thank you for the informative post.
  7. Best answer selected by samuelchoo.
  8. Thank you all! I fixed it. It was actually my PSU that went dead so I replaced it haha.
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