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USB Port fried (visible smoke), now display wont turn on

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#1 logicalpinecone


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Posted 17 December 2017 - 10:15 AM

This morning, I was using my computer normally, nothing seemed unusual, other than my Ethernet cable not being recognized by my motherboard. I waited a while and rebooted and the light for the Ethernet cable being detected came back and the computer started working as normal. After about an hour, I needed to print something and decided to plug in my printer USB cable. As soon as I plugged it in, the USB port started smoking, and before I could turn off my computer, it shut off itself. 


At this point, I made sure that the smoke and smell emitted from the computer was indeed from the USB port and NOT from the PSU. I assumed that this fried USB port could be due to the port being unused and undusted for months. I waited about an hour and then turned on my computer. All LED lights, fans, accessories (keyboard and mouse), turned on as normal. I was able to change settings on my keyboard and changed light options. All fans within my computer, 4 external fans, CPU fan, GPU fan, were all working as intended. However, there is no display. I'm not quite sure why.


I have two monitors, one is connected via DVI port and one is connected via HDMI port, both to my GPU. However, neither seem to be recognized properly. After turning on my computer, there is no smoke or smell being emitted. My next step plan is to open up my computer and dust it out, and see if the visible capacitors on the motherboard are fried.


I have turned off the computer, unplugged all plugs and turned off power (PSU). Unfortunately I dont have any spare PSUs, motherboards, or GPUs to troubleshoot with.


Any help would be greatly appreciated. Thanks!







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#2 dc3


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Posted 17 December 2017 - 11:44 AM

Have you opened the case to inspect the motherboard and GPU for scorch marks or signs of arching?


Unfortunately your motherboard doesn't have integrated graphics, so you're stuck with the GPU.  If you purchased the GPU locally you may be able to get them to at least test the GPU at their shop, or perhaps loan you one to see if this is the problem.


Is this USB port onboard (physically attached to the motherboard)?  If it is one of the external USB ports (attached to the motherboard via cable) disconnect the connector from the motherboard and see if the video works when you restart the computer.

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#3 logicalpinecone

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Posted 17 December 2017 - 11:58 AM

Hey, thanks for the input. The USB port is physically attached to the motherboard. That is, there are no visible connectors and it is connected underneath a metal coating. I opened up the case and looked for physical markings on the USB port, motherboard, and GPU and can't seem to find any. Even directly at the point of smoking (the USB Port), there are no physical signs or fried capacitors. The GPU fans power up as normal and it seems to be running as intended. There is no smoke, or smell coming from the computer after turning it on. And all peripherals still work as intended. I've also tried unplugging all peripherals, and leaving only the HDMI cable and power cable connected. This does not seem to make any difference.

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