| Mac USB problems behave in various ways, but | | | | locate the problem. For example, if your iPod is acting |
| traced to the resources they may be quite simple, and | | | | up, check whether your mouse or an external drive |
| before you take your PC to the Mac service centre | | | | can connect to the PC via that USB port. In this |
| you can try to fix your Mac USB problem by yourself. | | | | method you can confirm if the problem is in that USB |
| Here I will list some general rules when troubleshooting | | | | port or in one of your USB devices. |
| your common Mac USB problems. | | | | Step 5 Disconnect all USB hubs in use and reconnect |
| Step 1 Check whether the USB hardware is | | | | each peripheral device one at a time to your computer |
| connected to the appropriate jack. There is a USB | | | | with a good USB cable and find the cause. |
| port in the back of most keyboard devices, but it | | | | Step 6 Reset NVRAM (nonvolatile RAM) and PRAM |
| usually only works with a mouse. | | | | (parameter random access memory) on your |
| Step 2 Unplug your USB device and wait a few | | | | computer: shut down your Mac, then start it back up |
| seconds, then plug it back in. It might seem almost too | | | | while immediately holding the following keys: Command, |
| rudimentary, but this is an oft-overlooked fix that's | | | | Option, P and R. Hold the keys down until the |
| successful in a surprising number of cases. Restart | | | | computer restarts and you hear the startup sound for |
| your computer if the malfunction still lingers after you | | | | the third time |
| reconnect the USB device. | | | | Step 7 Disconnect other power-drawing USB |
| Step 3 Test your USB device in another computer. If | | | | hardware from the same bus or adding an externally |
| the issue persists in the second computer, probably | | | | powered hub. The connectivity and recognition |
| your USB driver is out-of-date and this issue | | | | problems can be simply solved by this method in most |
| particularly happens after system updates, well then | | | | cases. |
| check your device manufacturer's site or just | | | | Step 8 Clean your computer's hard drive after back |
| download a driver tool like Driver Checker and PC | | | | up all of your data. |
| Driver Helper for any update. If it still fails, you may | | | | Step 9 Consider reinstalling your operating system. |
| have your device repaired. | | | | Finally, if all the tips above fail, you have to bring your |
| Step 4 Try different devices in the same USB jack to | | | | PC to the service center and have it repaired. |