Newly built computer-PSU, GPU, and front case fans turn on but CPU and back case fan does not

andinoslo

Commendable
Jan 13, 2017
2
0
1,510
This is a new computer, all new parts (except for RAM) and just put together. When turned on, the monitor does not receive a signal (dvi connected the to GPU), the PSU, front case fans, and the GPU fans spin, but the CPU, CPU fan, and back case fan do not turn on.

I have built around 5-6 computers so I’m mildly experienced. I have gone through all the steps here: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

History:
While building I followed the manual. Nothing unusual really happened. I got confused at one point with some wires for the case fans and accidently connected the front case fans into the PSU twice (there’s two options to connect it to the PSU and I accidently did both options).

The first time I turned on the computer I sort of forget what happened. I’m pretty sure the PSU turned on for like a second and then shut off. After realizing my mistake with the case fans I fixed it and tried again. PSU, front case fans, and GPU all turned on. CPU, CPU fan, and back case fan didn’t turn on.

Things I have already tried (in addition to the above post):
- Taking the whole thing apart and putting it back together again (did this about three times)
- Triple checking everything is plugged in
- Receding the CPU cooler to the CPU
- Trying with a different PSU
- Trying different RAM
- Trying all slots for the RAM (also did this with the different RAM)

Things I’ve noticed:
- I have a lightup mouse. I have connected the 3.0 USB connector to the motherboard and then the mouse to the USB port. The mouse does light up (evidence that the motherboard has power to it?)
- When I turn the PSU on and the computer on, the back case fan and the CPU fan do not turn on. But, when I turn the PSU off in order to turn the computer off, the back case fan and CPU fan turn a tiny bit a second after I turn off the PSU. What does this mean?
- I don’t have enough USB connectors on my motherboard for all of the USB ports my case has, so those extra USB cords just sit inside the case not being connected. Not sure if this is relevant but I thought I would mention it.

Specs:
CPU: Intel i3 6100 (https://www.superbiiz.com/detail.php?name=I3-6100BOX)
Motherboard: ASRock B150M Pro4V (http://www.newegg.com/Product/Product.aspx?Item=N82E16813157706)
RAM: Corsair Vengeance LPX DDR4 16GB (I only have one stick in my build, got it from a friend) (http://www.newegg.com/Product/Product.aspx?item=N82E16820233853)
CPU Cooler: CRYORIG M9i Mini Tower Cooler (http://www.newegg.com/Product/Product.aspx?Item=9SIA4UF39E2338)
GPU: PowerColor PCS+ Radeon R9 380 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814131703)
PSU: Rosewill Photon-750W Gold (http://www.newegg.com/Product/Product.aspx?Item=N82E16817182323)
SSD: MICRON M600 256GB (http://www.microcenter.com/product/467511/m600_256gb_sata_iii_m2_ssd)
Case: Rosewill Rise - ATX Full Tower Gaming (http://www.newegg.com/Product/Product.aspx?Item=N82E16811147226)

I do not have a system speaker btw. Should I invest in getting one to help with troubleshooting?

Any help/suggestions would be great. I can post pictures or any other information if you guys need it.
 
Solution
There are 2 wires on psu think black and green can be joined to bypass switch and use power supply while unplugged from motherboard. Suggest Google, find and join these wires and try it. Should get 5.0 and or 12 volts from plugs to HDD and stuff. Try any old cpu that will fit socket properly and don't put heat sink and fan on then replace it with good cpu again. Just to see if different cpu do any different. Give us feedback and more info.
Remove cmos battery and short terminals to clear it can do often during tests to be certain.
Make sure no pins bent or missing on cpu. Make sure recessed switch on back of psu is not set to 220 volt switch it over and back while unplugged. Since you tried another psu it must be in mother board or...
Aug 27, 2014
88
0
4,660
There are 2 wires on psu think black and green can be joined to bypass switch and use power supply while unplugged from motherboard. Suggest Google, find and join these wires and try it. Should get 5.0 and or 12 volts from plugs to HDD and stuff. Try any old cpu that will fit socket properly and don't put heat sink and fan on then replace it with good cpu again. Just to see if different cpu do any different. Give us feedback and more info.
Remove cmos battery and short terminals to clear it can do often during tests to be certain.
Make sure no pins bent or missing on cpu. Make sure recessed switch on back of psu is not set to 220 volt switch it over and back while unplugged. Since you tried another psu it must be in mother board or something wired wrong still or the cpu isn't properly seated or the screw isn't turned to hold cpu in place or heat sink paste is on components on top of cpu clean with ALCOHOL. 99% several times. Don't need to put heat.sink or paste for quick test purposes. Can just try to turn on. You don't have the power button hooked up properly or reset button is stuck on....remove those wires and short out terminals for power on or join wires mentioned upon Google search for specific wires to bypass internal.switch once front panel connectors are disconnected. Make sure no hair or lint is in ram slots won't take much... try 1 ram at a time make sure is not too fast for motherboard using other ram. Note that these high powered psu needs particular power cable from wall and won't give enough power if using cheap ones? Check the tangs from where the motherboard ports are, are not bent and shorting on motherboard. It's floppy little tangs of metal tongues. . Check cables going to case.are not reversed from motherboard to front casing. Could be in wrong slots so remove all. Maybe it's over one too many pins or reversed. Make sure cmos reset pin isn't in place if Exists on particular moBo. .
 
Solution

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