Windows XP - Power surge on hub port

Question

Since last few weeks I constantly get this error, as status bar balloon:
Power Surge on Hub Port - A USB device has exceeded the power limits of its hub port.
Due to this now I am unable to access any USB devices properly, they get disconnected intermittently.
I did quite a few things to resolve this problem, firstly obviously through the Windows help. I even tried all the things told on the Microsoft website(which essentially says is to check and update the driver) but in vain.
One suggestion, I found when I google'd was to disable the USB2 controller through the Device Manager and since at every startup the System configuration comes up complaining that it has been changed etc.(On that same site it is mentioned to ignore this message.)

But after everything I still cant solve this problem.
Any help is much appreciated.

The system is installed with Windows XP service Pack 3 and all the updates till last month.
Please let me know if any other hardware info is required.

**UPDATE**
My laptop is about 5 years old now, its an HP with Celeron 1.4G processor. Windows XP SP3 installed. All latest windows updates installed. 2 USB ports available. BIOS is HP 68DTD ver F.0A

Do I need to update my BIOS from somewhere ? or is this a hardware problem altogether?

Answer 1

Typically, I see that message in relation to a surge at the time of connecting a USB device and especially with Dell computers. External USB hard disk drives in particular can draw enough current to trip the built-in protection of the USB port. Each manufacturer designs their own circuit to detect the surge, and it is possible that with age the circuit is more sensitive today than the past. Drivers won't help, as this is probably a hardware-only circuit.

3 potential remedies

• Isolate the device in question to a particular USB port. If your computer has 3 USB ports, one of those is likely on its own USB controller and also power circuit.
• Get a powered USB hub with a power supply capable of delivering more than 500 ma, preferably 1000 ma.
• Connect your pen drive prior to powering on your computer. This prevents a surge at the time of connection.

Answer 2

1. ) Visually check all your USB ports for damage.

2. ) Open device manager and expand USB Controllers, right click on all the sub entries and select "uninstall", one at a time. Once this is done click the "scan for hardware changes" Icon at the top of DM, it will reinstall all the drivers, see if USB works now.

Answer 3

That error means you are drawing too many amps for one of your USB hubs (motherboards usually have multiple USB root hubs).

If you go into Window's Device Manager you can find the USB 'root hubs' in there, and if you check each hub's properties it should tell you the maximum mA (milliamperes) available for that hub (or it's ports) and how many mA your devices are currently drawing (probably under a 'power' tab, it's been a while since I used XP ;) ).

Try unplugging a couple devices and see how it goes. Or rearrange them to keep ones that draw a lot of power in different 'sets' of USB ports.

You want to be using less mA than are available. Also, devices will use more when being used then when sitting idle, so try and leave 'extra' mA on each hub.

For example, if you have a USB scanner and you start scanning, it draws more mA. Suddenly your USB mouse and USB HDD stop working because you overloaded the hub they all share by drawing too many mA, exhausting what was available for that hub.

Hope that helps...