My desktop computer always restarts when I connect any USB media – Pendrive,
External ROM and External Hard drive. Can you tell me the cause of my PC
I’m not trying to be annoying about it, it’s just that from the description
you’ve given it could be one of any of hundreds of different reasons.
The best I can offer is to walk through some of the most common causes to
help you further diagnose – and perhaps repair – the problem.
I would start by making sure that Windows is as up to date as possible. In this case, Automatic Updates may not be enough. Instead, visit the Windows Update web site.
Windows Update will often include many “optional” updates that automatic updates may not. (Automatic updates focuses on “Critical” or “Important” updates. We want to see the optional ones as well.)
It’s possible that there may be additional optional updates relating to USB devices, your computer’s motherboard, or its USB interfaces. I typically consider taking all the optional updates, but at a minimum take any that appear to apply to those devices.
If that doesn’t resolve the issue, then I’d take the next step and visit the computer manufacturer’s support site to see if they have updated drivers. It’s not uncommon for the manufacturer’s site to have more recent updates. Once again, look for updates relating to your computer’s USB interfaces, as well as the motherboard in general.
Failing all that, it’s possible that reinstalling Windows from scratch might help, but I’d not be particularly hopeful. I’ll throw it out as an idea, but it’s not one that I’d rush to try just because it’s a fair amount of work.
Time to look at hardware.
Naturally, I’d try every USB port on your machine. If it’s just one port, or one set of ports, that points to a potential hardware issue with those ports. Personally, if I found even just one port that worked reliably, I’d get myself a USB hub, connect it to that port, and stop trying to use the ports that had a problem.
You indicated that any device causes a problem, so I’ll assume you’ve tried several, as well as alternate cables.
If you’re one to open up your computer, I’d double check the cabling inside for the USB port – making sure that it’s oriented and seated properly into its motherboard connector.
I’d make sure that the machine was properly grounded. Static electricity – particularly on some machines and particularly if not properly grounded – can cause a spontaneous reboot, and inserting a USB device could be the source of some static. (Try touching the machine with your other hand first before inserting the USB device.)
Finally, if all of the above fails to resolve the issue, it really does point to a hardware issue. In fact, I’d go so far as to say a hardware issue on your computer’s motherboard.
In most cases that means it’s time to find a technician to further diagnose and repair the machine.