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CPU light red on motherboard

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prodisaiah

PCHF Member
May 12, 2022
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So my computer wont turn on after i tried fixing a bent USB 3.1 pin on the motherboard. Ive already did the test to see if any of the other components are bad. I even replaced the motherboard with my old one that ran before, still haven't got any luck with it. The computer turns on for about a minute and turns off, then it automatically turns on again and back off after a minute constantly. I moved the ram sticks and cleaned them. I disconnected the GPU and still the same thing. I took out the CMOS battery and same thing. The only light on the motherboard is the CPU light and its a solid red. I don't get any display or beep from the motherboard. I was going to take it to someone to figure it out but thought id try to see if someone online could help me with it first. I don't know what else to do from here.

PC Specs
Motherboard - GIGABYTE Z390 GAMING X LGA 1151
Old motherboard - ASRock B365M Pro4 LGA 1151
CPU
- i7 9700k Water cooled CPU
Ram
- 16 GB 3600mhz
PSU
- 500 watt
GPU
- SAPPHIRE Pulse Radeon RX 580 8gb
 
neither of those mobo's have an onboard speaker, have you added one to be able to hear any beeps?
and the work you did on the USB pins, this was on the back panel of the motherboard on one of the USB ports?
and you had the PC turned off during this?
do you remember which pins were bent, and what they were in contact with - the neighbouring pins or the metal shroud?
 
I have not hooked up a speaker at all, do you have any recommendations on which one to get?
The usb pins were on the actual motherboard next to the 24 pin power supply plug.
They weren't in contact with each other but I wanted to plug in the cable to it so I could use the extra usb ports in the front as i couldn't plug it in when i first built the pc because of this issue.
The 2nd from top on the left side of the pins was bent and I used a pair of tweezers to straighten it out. I made sure to ground myself and turned the computer off before doing so. As I moved the pin back to being straight the computer powered on by itself and began doing the power cycle. I'm assuming i may have shorted something and touched another pin with the tweezer? I'm not sure but that's what I'm thinking
 

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OK, no speaker, so that rig would never have given any beeps (good or bad) when starting.
these are the type you want;
1652417280646.png

cost about $2.

this is the pin out diagram for USB3 headers;
1652417646390.png

so your "2nd from top of left side" would be 2nd from bottom on right side in this pic (if I've got it all right).
that is the 5volt VBUS pin, and earthing that could do who knows what if their was residual charge still stored in the capacitors.
the fact the PC powered on isn't a good indication.
 
its the ground pin, the layout is upside down on the actual motherboard.
The no pin is on the top right, so what would I need to do now? Buy the speaker and see if I get any beeps on boot?
Did it short something out and we aren't sure where the short could be at?
 
because the PC turned on, you can be confident that something (somehow) was shorted.
unless you accidentally hit the power button!
ideally (and for future reference) also unplug the PC and then hit the power button, that will drain the stored charge kept in the capacitors.

we all know the PSU jump start trick of shorting pin 16 (the green cable) to a ground pin (any black cable) but I've never heard of a similar thing with USB3 headers - but hey, USB3 is the new kid on the block, maybe know one has ever tried!

getting a speaker will just help indicate where the issue may be; 3 quick beeps mean memory problem, 2 quick 1 slow beep means something else, and so on.
so even after potentially knowing where to look, I feel you may still need to take it in to get fixed.
because who knows what has failed, the beeps may indicate one component, you fix that only for the next issue up the line to become known.
at the shop, the guy can attached a speaker, replace part A and start looking at the whole thing.
with all the parts at hand.
quick turn-around, but yes, you pay for that!
 
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