USB ports not working properly

I have a pavillion dv4 1123us - old.  It is not recognizing usb devices - although the usb ports are still providing power.  I have tried reinstalling the chipset and reinstalling the usb ports by deleting from device manager.  Intermittently, my modem seems to fade in and out but is easy to reset - just annoying.  I have tried to find a way to reinstall the bios but have been unsuccessful.  Please give suggestions.

USB devices can be rather problematic as you probably already know. Thus I'd start the troubleshooting process in this situation by plugging devices (one at a time) directly into the Mac, dispensing with the hub, to see whether problems continue or not. If they do, then it means the hub is not to blame while it the problems don't recur, the hub is the culprit and would warrant being replaced.
Be aware however, that since USB is controlled by the CPU, the rate at which data streams is dependent to some degree on what else the system is doing. Thus you can help reduce issues by ensuring the system isn't busy with other tasks while you have something critical going on via USB. Or, as you discovered with MP3 playback, use firewire instead. Firewire is controlled by a dedicated controller, so performance doesn't vary with system load. That's why it is generally recommended that for situations where data needs to be streamed to or from external devices such as video cameras, hard drives, DVD burners etc, these are best connected via FW rather than USB.

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    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
    Follow @LenovoForums on Twitter!

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    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
    Follow @LenovoForums on Twitter!

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