Question New Build won’t turn on

[Rayzuh]

I already tested my PSU with the tester that came with it and it worked. When I plugged in all of the necessary cables into the motherboard and turned on the PSU switch, the CPU cooler fan light would flash once but when I clicked the power button on the case nothing would happen.

I have tried putting both RAM sticks individually in every slot, and I have already made sure I plugged in fully each cable while also trying to jump the Power Sw +\-

Is it possible that the PSU can still be faulty even if the tester it came with worked? I have been trying to figure out this issue for 10+ hours but still can't find a solution.

Note: My first MOBO was DOA when it came in so l got a new one, so I don't think the MOBO is the problem

https://imgur.com/a/only

 

[Rayzuh]

https://imgur.com/a/only

View: https://imgur.com/gallery/only-flickers-x3Ksqmc

 

[Danra]

Try removing everything but the CPU. If the system responds properly add one item at a time. I have seen a great deal of weird problems in 35 years of working in computer hardware.

By the way, Firefox will not allow me to look at your pictures because another site has it embedded. And, I didn't force the image to display.

 

[Paperdoc]

You may have a problem with misplaced or missing stand-offs. See my post of July 14/24 in this thread

https://forums.tomshardware.com/thr...whats-wrong-with-my-pc.3849350/#post-23300248

for an explanation of what MUST be done to get these items right.

 

[Danra]

You may have a problem with misplaced or missing stand-offs. See my post of July 14/24 in this thread

https://forums.tomshardware.com/thr...whats-wrong-with-my-pc.3849350/#post-23300248

for an explanation of what MUST be done to get these items right.

Good idea mentioning stand-offs. In addition to supplied metal stand-offs, for decades I used cut to length sections of glue gun sticks in unsupported areas for my computers as well as those I built for others. Solves the problem of possible inadvertent grounding, closed circuit.

 

[Syntaximus]

Standoffs and front panel connectors too.
Everything can be in working order but if the +/-s pins aren't right, you'll get nada.

 

[Rayzuh]

You may have a problem with misplaced or missing stand-offs. See my post of July 14/24 in this thread

https://forums.tomshardware.com/thr...whats-wrong-with-my-pc.3849350/#post-23300248

for an explanation of what MUST be done to get these items right.

Im sorry, Can you explain more? I have not put it in my case yet and the MOBO is sitting on top of its box

 

[Paperdoc]

If your mobo is not mounted in your case yet, the stand-offs are NOT your problem currently. But you really should look at that post I cited for after you do get the system working OUT of the case.

Breadboarding is a troubleshooting technique. It is named that way because you place your mobo and components on an insulating surface like a dry wooden board. Emphasis on INSULATING so not short circuits.

One item caught my notice. Many mobos are set up to protect the expensive CPU chip from damage caused by poor CPU cooling. There MUST be some cooling device like a fan plugged into the CPU_FAN header, and it MUST start up right away when power is turned on. If that header gets NO fan speed signal back from its fan (or pump) it may simply refuse to allow any start-up.

The starting point for this style of troubleshooting is to have the mobo on a safe surface and mount in it only these items:
1. CPU WITH its cooler connected to the CPU_FAN header
2. ONE stick of RAM - check mobo manual for the correct slot for a single stick
3. Power supply to mobo from the PSU, inlcuding any power connector for the CPU chip
4. Cable connected from mobo video output socket to a monitor IF your mobo and CPU chip provide on-board video output, and no extra video card in a PCIe slot. HOWEVER, IF you MUST use a video card because the mobo cannot do this, then install a card in a PCIe slot and connect to that.
5. NO SSD in a mobo socket, NO HDD attached by cable to the mobo ports, NO keyboard or mouse attached.
6. NO connection to case controls and cables.
7. It can be helpful if you get a small "speaker" unit designed to plug into the SPKR pins of your mobo's Front Panel header. During start-up the mobo can send out sounds by these pins only with "beep codes" indicating success or trouble codes.
8. To "turn on" use a small screwdriver to short together briefly the two pins of the Front Panel header marked for the case Power Switch wires. Brief contact is enough - do not try to keep the pins shorted together.

With this set up what SHOULD happen is that the mobo does go through a start-up sequence with its CPU cooler fan running and produces messages on the monitor screen about its progress until it tells you there are errors like no keyboard and no mouse and no Boot Device. If you get that, it is all working correctly and you can shut down, add ONE component to the board, and try again. As long as it succeeds, keep up this process. When it fails, you know which new componenet caused that.