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computer wont power on

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  • Components
  • Power
Last response: in Components
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February 21, 2014 8:03:12 PM

So I bought a new cpu and mother board to upgrade from an AMD phenom II x4 to an intel i5 Ivy Bridge cpu ...which obviously meant also changing boards. I also bought a new video card to upgrade from Geforce GTx 650 to Geforce GTX 770 4gb...

The computer has a 700 watt power supply, 8 gb ram, 1 SSD and 1TB HD, and one optical drive.

After hooking everything up and following the instruction book for the front panel connections I plugged the system in and switched on the power supply.

Immediately all the motherboard led lights came on... GPU boost light, some new power save switch light, and the pc power light near the front panel connectors.

So then i pressed the power button. But nothing happens. No fans, no noise, no lights, nothing.

I've tried unplugging everything except the essentials including the SSD (my primary drive) and still nothing. I've unplugged the front panel connectors and replugged them back in several times even replacing the power connector with the reset button instead to see if that would work.

I tried reseating the cpu and heatsink to make sure it was all in perfectly, and tried removing 1 stick of ram then both sticks of ram. And yet still nothing.

I am at a loss as to what the issue could be. Anyone have any experience with this kind of problem?

More about : computer wont power

February 21, 2014 8:10:09 PM

Remove everything from the case, and just install a single stick of ram, with the cpu and cooler, and do a bread board test. Doing so can rule out a lot of possibilities.
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February 21, 2014 8:14:08 PM

jeremyp79 said:
Remove everything from the case, and just install a single stick of ram, with the cpu and cooler, and do a bread board test. Doing so can rule out a lot of possibilities.


What is a breadboard test?
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February 21, 2014 8:38:04 PM

Thats basically running the system without a case :-) hook up power to board, cpu, one stick of ram, and monitor on a table, and it's a good way to chase down annoying issues.
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February 21, 2014 8:39:32 PM

jeremyp79 said:
Thats basically running the system without a case :-) hook up power to board, cpu, one stick of ram, and monitor on a table, and it's a good way to chase down annoying issues.


dont you need the hard drive hooked up too for it to work?
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February 21, 2014 8:44:30 PM

You don't need the hard drive to troubleshoot power problems. Basically you get it to the minimum it takes to POST, then add pieces one by one to see if the problem reoccurs
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February 21, 2014 8:45:40 PM

jeremyp79 said:
You don't need the hard drive to troubleshoot power problems. Basically you get it to the minimum it takes to POST, then add pieces one by one to see if the problem reoccurs


And if the pc still doesn't turn on? How do i know what is stopping it from doing so?
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February 21, 2014 8:48:40 PM

If that doesnt work, your down to 4 options. Cpu, motherboard, or PSU. The PSU can be tested independantly of the system to be sure it turns on and works, and with everything coming on when you flipped the switch, it most likely will.
Another thing breadboarding does is force you un plug and replug everything, which will lessen the possibility of an improperly seated plug or something being the root of the problem.
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February 21, 2014 8:50:00 PM

jeremyp79 said:
If that doesnt work, your down to 4 options. Cpu, motherboard, or PSU. The PSU can be tested independantly of the system to be sure it turns on and works, and with everything coming on when you flipped the switch, it most likely will.
Another thing breadboarding does is force you un plug and replug everything, which will lessen the possibility of an improperly seated plug or something being the root of the problem.


if the lights on the motherboard come out would that rule out the psu and the motherboard?
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February 21, 2014 9:03:36 PM

Most likely, but not definitely
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February 21, 2014 11:10:23 PM

jeremyp79 said:
Most likely, but not definitely


So it would appear to be a problem with the CPU or Motherboard.

I stripped it down to just motherboard, psu, and cpu with the front panel connectors and nothing... But i plugged my old motherboard back in with the new video card and it works fine.
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February 21, 2014 11:22:45 PM

Pull the cpu off and see if you possibkly bent a pin while installing it.
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