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Self-assembled PC won't boot.

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  • Motherboards
  • Boot
  • Build
  • Power
Last response: in Motherboards
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October 11, 2014 6:53:51 PM

I have had a self-assembled PC for a couple years now. Everything worked fine for as long as I had it. This was my build:

Motherboard - ASUS P8Z68-V LX
CPU - Intel core i7
GPU - EVGA GeForce GTX 770
Hard drives - 1x SSD (C: drive), 1x HDD (D: drive)
PSU - ULTRA 750W ATX
Case - Apevia X-Dreamer3

Yesterday I bought a new PSU and a new case.

PSU - ULTRA X4 850W ATX (Modular)
Case - NZXT Phantom 410

I put everything together, ensured all power cables are plugged in, RAM and GPU are clipped in all the way. I plugged in the power cable, and the small motherboard LED came on. I pressed the power button and all the fans came on. The CPU heatsink and the GPU fan came on. The hard drives began running. Despite all this, the computer does not boot. The monitor says there is no connection, and the lights in my keyboard and mouse do not come on (No ancillary devices work). I can't figure out what the problem is. Here is a list of the troubleshooting I have tried:

- Unplug power cable, hold power button for 1 min. Plug power cable back in, and turn the computer on.
- Ensure all power cables are plugged in tightly.
- Swap out the power supply for my old one.
- Use only one stick of RAM.
- Disassemble and reassemble everything.
- Take out the GPU and try booting without it.

The only thing I haven't tried yet is putting everything back in the old case, although I don't see how that would make any difference. From what I've read online it's probably a motherboard or a CPU issue. I don't think it's the motherboard, just because that motherboard LED works. I put this thread under motherboards anyway, because I didn't know where else to put it.

My only last note is that to get the computer to start up, as far as it can, I have to turn the PSU switch off and on again, hit the power button and then immediately push the 24-pin power connector into the motherboard and then all the fans start working. As soon as the fans start I can stop pushing the 24-pin power connector and everything will stay on.

I am out of ideas, and really need help. I welcome any thoughts, theories, question or troubleshooting hints. Thanks.

More about : assembled boot

a b V Motherboard
October 11, 2014 6:58:46 PM

Take the mobo and PSU out of the case, lay it out on a table and try to boot with only 1 stick of RAM and CPU connected. If you get to the POST screen, add the rest of your RAM one stick at a time. If it keeps booting, add the GPU.

I always try it this way prior to installing it in the case....
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a b V Motherboard
October 11, 2014 6:59:47 PM

Well I would take out the ram to fully reset them. Also try take out the motherboard battery and leave it out for 5 minutes. If that doesn't work then try taking apart everything and putting it back together.
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a b V Motherboard
October 11, 2014 7:01:43 PM

Which I7 is it??

4 of them on the ASUS site need BIOS 3703, 3 of them need BIOS 0401 (<- dont think its these 3) and 1 needs 0602 of the BIOS

To support that CPU
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October 11, 2014 7:13:11 PM

I believe it's the 3rd gen i7, but I don't remember and I can't turn the computer on to find out...
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a b V Motherboard
October 11, 2014 7:15:57 PM

Short the pwr/gnd pins on the system front panel connector on the mobo . See if it turns on. Maybe the front of the case is stuffed

Or maybe the 24 pin is stuffed if you have to push it in all the time, its not making contact
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October 11, 2014 7:36:53 PM

I disconnected everything, took out the mobo battery and waited 5 minutes. I then put the battery back in, put one stick of RAM in, plugged the PSU into the 8-pin CPU slot and the 24-pin mobo slot. I pressed the power button. It started turning on, beeped once and then everything turned off. I placed a second stick of RAM in, and then tried turning it on (My RAM is part of a 2 sticks of 4gb = 8gb RAM thing) but then nothing happened when I tried to turn it on.

Paul, I don't know how to short the pwr/gnd pins.
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October 11, 2014 7:38:55 PM

Also, I don't think it is the 24-pin because it was working yesterday, and even with my old PSU it's not working now.
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a b V Motherboard
October 11, 2014 7:47:07 PM

Short it with a screwdriver Its the panel you connect the front connections to from the front of the case
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