My computer sometimes shuts off and turn back on sometimes when I plug something into a usb port.
Sounds like you need to check your Manufacturers web site, Support and drivers, for the latest drivers.
My Motherboard drivers are all up to Date. Can you think of anything else that might cause this. I typed this issue into yahoo.com and found a few posts that said it could be a issue with the motherboard shorting out or the power supply not being big enough. My motherboard requires a 500W or bigger power supply and I am using a 750W power supply.
Next thing I would look for is damage in the port. Does it happen in all ports universally?
There's a small chance that this will happen when the power supply is just barely overloaded, since the motherboard will suddenly be drawing more power right after a USB device is plugged in.
The ports have no damage at all.
How can I tell if this is happening. I don't think the power supply is being overloaded. I am running a computer at stock speed not overclocking at all. The video card I have does not even connect to power supply. My computer also shuts off and restarts when I try to enable ahci mode too.
Since it appears your problem is hardware related I would disconnect the power to your machine. open the case and check every connector on power supply, hardware and mobo as a basic starting point.
How much wattage your PSU needs to be is determined by way more than your motherboard. You have to take into account all hardware connected to the PSU as each piece of hardware will be drawing power from the PSU.
I checked all the connectors from the power supply and they are all tight.
This is the spec. of my computer
Gigabyte Z68AP-D3 V2
CPU = Intel core i7 2600K
Memory= Corsair Vengeance 16G
Sony Optiarc DVD Drive
ASUS Blu-ray burner
Ultra LSP750 750 Watt power supply
Hard drive = Seagate Barracuda 1TB
Video Card Geforce GT 430
Samsung 830 SSD
Everything list above came as a build kit but the video card, Blu-ray drive, and ssd. When my computer shutoff and turned it self back on all I did was plug a USB cable for a cell phone but the cell phone was not pluged into the cable when the computer shutoff and turned it self back on.
Also keep in mind that a power supply in the process of going bad may not actually handle it's full rated wattage, and may be stable at a lower than rated wattage for years rather than failing completely and catastrophically.
Additionally, the individual "rails" of the power supply also have their own individual limits which are lower than the total limits of the supply. Most of the power tends to be distributed to the 12 volt rails, but USB, as well as most board-mounted components are probably drawing from the 5V rails. A label on the power supply will state these individual limits, usually this label is visible from the inside of the PC on the top or side of the power supply.
Does it happen on all USB ports?
It only happens to the front usb ports on the case.
This is the spec. for my power supply.
Manual 130v & 220v Switching
115 ~ 230
That is why I still suspect some hardware damage. I would recommend simply not using them and get a HUB off the back ones. It happens a lot
If this happens as soon as you plug in a usb device, then its most probably the port shorting out. It does tend to happen sometimes, but rarely is this a software or power issue.
Hopefully your case is an aftermarket model. If so, you can start by removing the usb ports from the front (hopefully they're screwed in and not glued on). Keep the header plugged into the motherboard, but have it detached from the case. Holding it in your hand (or just not touching anything metallic), power on your computer and plug in a usb device. If it still powers off, then there's probably something wrong with the ports themselves. If it stays on, then its definitely a short.
If you conclude that its a short, power off your computer and reassemble the usb header onto the case. Just make sure that nothing metallic is touching the usb port itself. If you can't isolate it, try covering it in a piece of paper before screwing it back on.
I had this problem but in the end discovered I had a few burnt out leads both USB and Sata, I threw them away bought new ones. no more problems. but make sure you check the ports on the Machine, one was burnt out so I taped across it
Can you give me more info on how to check for this.
I'll try, I was getting the same as you in fact mine was worse at times. I asked my youngest son who is in IT who proved it in front of me. Check any USB or sata ports on the rear of your M/C any that look remotely scorched DO NOT USE and the same with the leads. I threw away several thankfully after buying new leads it is now working
Put me in the "you are suffering from hardware failure" camp.
Check your USB cables first; if this only happens on the front panel jacks, it could just be bad or incorrect wiring. There will not be much you can do if those jacks are bad.
I can't stress this enough: if those ports make your computer reboot, DO NIT USE THEM. At all. This is likely a ground failure, and you could be feeding voltage back into the signal pins, slowly tearing apart your southbridge every time you connect a Flash drive or your digital camera.
If this also happens with the rear panel, then you almost certainly have a power supply or motherboard failure. Try the power supply first, then the motherboard.
I am going to stop using the usb ports on the front of my case and I am going to get my self a usb hub for the back of my computer and use that for other usb devices.
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