Question CPU or Motherboard Dead?

Feb 24, 2020
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I bought a Gaming Computer from a friend that broke on him and I have been trying to fix. When you turn it on it will light up fans will go and only start for a second then shut down. Sometimes it will start up but if it has been turned off for a few hours it goes back to not starting again. I've swapped out the RAM, SSD, Graphics Card and Power Supply to test and have had the same issue. I brought it to a PC repair shop and they told me the issue was the Motherboard. I got a used motherboard online and rebuilt the machine. Got the same exact thing with it only starting for a second then turning off. Could it be my CPU at this point?

CPU-i7-4790K
Motherboard - Sabertooth Z97 Mark 1 or Gigabyte Z97X UD5H
PSU- AX860
Graphics card- Geforce GTX 1080 PCI express 3.0
SSD- 960 EVO Sata 6 Gb/S
Ram- 2X Vengeance Pro DDR3 2X4
CPU cooler- Bequiet Rock Pro 4
 

geckovic02

Prominent
Jan 21, 2019
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21
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I bought a Gaming Computer from a friend that broke on him and I have been trying to fix. When you turn it on it will light up fans will go and only start for a second then shut down. Sometimes it will start up but if it has been turned off for a few hours it goes back to not starting again. I've swapped out the RAM, SSD, Graphics Card and Power Supply to test and have had the same issue. I brought it to a PC repair shop and they told me the issue was the Motherboard. I got a used motherboard online and rebuilt the machine. Got the same exact thing with it only starting for a second then turning off. Could it be my CPU at this point?

CPU-i7-4790K
Motherboard - Sabertooth Z97 Mark 1 or Gigabyte Z97X UD5H
PSU- AX860
Graphics card- Geforce GTX 1080 PCI express 3.0
SSD- 960 EVO Sata 6 Gb/S
Ram- 2X Vengeance Pro DDR3 2X4
CPU cooler- Bequiet Rock Pro 4
In the worst case you forgot the thermal paste on the cpu
 
Feb 24, 2020
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is the cpu fan spinning when you start it up?

you said it sometimes starts up, boots to windows? how long it stays running?
It only stays on for a second literally a one missisippi . Yes the CPU fan starts spinning then stops.
 

geckovic02

Prominent
Jan 21, 2019
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21
565
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I only put a dab on it. Do you think I need more? Would that cause it to shut off after just a second?
It's maybe stuck in a bootloop. Take everything off the motherboard and only boot it with the motherboard, cpu + cooler and the psu installed (24pin and cpu power cable). Plug in a vga cable into your mobo if you can, if not listen if you get a beep.

If yes, shut off the system, add the ram and bot again. Do that until you can figure out what componement is doing problems.

If it shuts of again, it will probably be the cpu, as you already changed motherboard and psu?
 
Feb 24, 2020
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i would remove the cpu and have a pc shop test it, unless you have a spare laying around
Unfortunately I don't. Seeing as two totally different Motherboards are giving the same issue I am kind of leaning towards CPU. Thanks though
 

SamirD

Honorable
Jan 16, 2014
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It's maybe stuck in a bootloop. Take everything off the motherboard and only boot it with the motherboard, cpu + cooler and the psu installed (24pin and cpu power cable). Plug in a vga cable into your mobo if you can, if not listen if you get a beep.

If yes, shut off the system, add the ram and bot again. Do that until you can figure out what componement is doing problems.

If it shuts of again, it will probably be the cpu, as you already changed motherboard and psu?
This is the method I would have used before paying a shop.
 
Feb 24, 2020
14
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It's maybe stuck in a bootloop. Take everything off the motherboard and only boot it with the motherboard, cpu + cooler and the psu installed (24pin and cpu power cable). Plug in a vga cable into your mobo if you can, if not listen if you get a beep.

If yes, shut off the system, add the ram and bot again. Do that until you can figure out what componement is doing problems.

If it shuts of again, it will probably be the cpu, as you already changed motherboard and psu?
Just did what you said and the same issue. Only starts for a second then shuts down. Yeah I just swapped out the Motherboard and PSU and the same issue. My only thought left is the CPU.
 

geckovic02

Prominent
Jan 21, 2019
99
21
565
5
Just did what you said and the same issue. Only starts for a second then shuts down. Yeah I just swapped out the Motherboard and PSU and the same issue. My only thought left is the CPU.
Ok so it's for 99% your CPU.

The 1% could be that both (Mobo's/psu's) are faulty xD
 
Feb 24, 2020
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Well I got and installed the new CPU and the same issue. At this point I am completely lost. I just tried swapping out cables even though the PC shop said they did that and the same issue. Totally lost.
 
Feb 24, 2020
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Feb 24, 2020
I bought a Gaming Computer from a friend that broke on him and I have been trying to fix. When you turn it on it will light up fans will go and only start for a second then shut down. Sometimes it will start up but if it has been turned off for a few hours it goes back to not starting again. I've swapped out the RAM, SSD, Graphics Card and Power Supply to test and have had the same issue. I brought it to a PC repair shop and they told me the issue was the Motherboard. I got a used motherboard online and rebuilt the machine. Got the same exact thing with it only starting for a second then turning off. Could it be my CPU at this point?

CPU-i7-4790K
Motherboard - Sabertooth Z97 Mark 1 or Gigabyte Z97X UD5H
PSU- AX860
Graphics card- Geforce GTX 1080 PCI express 3.0
SSD- 960 EVO Sata 6 Gb/S
Ram- 2X Vengeance Pro DDR3 2X4
CPU cooler- Bequiet Rock Pro 4

So I purchased a used Gigabyte Motherboard and swapped that out and had the same issue. I then got a used i-7-4790K to swap out. Same exact issue. When I turn on the computer it starts for 1 second then shuts back down. I have tried swapping out all my cables. I have pulled every thing out except the CPU and Motherboard and same issue. My PC shop and my friend both tried different PSUs but had the same issue. I even pulled the board out of the case and place it on cardboard to see if the case was short circuiting it and still had the same issue. I am at a lost at this point. Unless the Motherboard I bought online was bad as well. Thanks for any insight or help.
 
Feb 24, 2020
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So I have done that before and sometimes it turns on. Then when I shut it down for the night the next morning it won't boot again. This morning I tried to boot it again and it wouldn't boot just kept trying. I left my apartment for 4 hours came home and it booted right up. I am totally confused.
 

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