I'm not sure that this is the correct number of the laptop that I have having the problem with. I'm trying to solve a problem for a friend and I just remember that the laptop is a COMPAQ Presario. It is running under Windows 2000.
The machine has only 1 USB port. I wanted to be able to connect a LEXMARK printer T73 and a Microsoft keyboard, both with USB. The printer was working fine for several weeks before I tried to add the keyboard. I purchased a Belkin Thumb Hub that gave me 4 hubs. I plugged in the Belkin device and received an indicator light that led me to believe that it was working. However, after I plugged in my printer and keyboard, neither the printer or the keyboard worked. I then unplugged the Belkin device and plugged in just my printer to the existing port (back to the way it originally was) and now the printer that had previously been working will not work any longer. I noticed that the Thumb Hub says it is for Windows XP -- nothing about Windows 2000. I don't know what to do to get the printer working again. I have not tried to reload the printer drivers.
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Your USB hub cannot provide enough power for your external hdd, you can try to plug it in directly to any free USB port for the mean time to check if its detected or not, if it has a power button ( which is not normal for regular USB powered EXT HDD) make sure that it is on, if its still not working try to use a different cable, a known good cable or plug it in to a different computer to check if its your USB port, or the usb cable or the ext hdd that is causing the issue
Check the USB connection
The icon on the USB cable () faces up when the cable connects to the product correctly. Check the back of your product and the back of your computer to make sure the USB cable connects correctly and securely.
After you make sure the USB cable connects correctly and securely, review the following guidelines to check other potential USB-related problems:
USB ports on the keyboard.USB ports on the keyboard and in the front of some computers might not be powerful enough to support the product. If the USB cable connects to the USB port on the keyboard, try connecting it to another available USB port on the computer.
USB cable length.HP supports USB cables less than 5 m (16 feet, 5 inches) long. However, a USB cable that is 5 m (16 feet 5 inches) long must be of high quality. Otherwise, HP recommends using a USB cable that is less than 2 m (3 feet, 3 inches). Do not use patch cables to increase the length of an existing cable. Use apoweredUSB hub if you need more length.
Alternate USB ports.Connect the USB cable to another port on the computer to make sure that the USB port on the computer is not the cause of the problem.
Defective USB cable.Replace the USB cable to make sure that the existing cable is not defective.
Conflicting USB ports.Disconnect any other USB printers, USB scanners, USB cameras, and any other USB connected peripherals. Start reconnecting these devices one at a time to determine if one of the devices is using too much power. Consider purchasing and installing a powered USB hub if necessary.
A USB-powered hub is a device that increases the number of available USB ports on a computer and facilitates communication between the USB devices and the computer. A powered USB hub can resolve communication failures between some, but not all, USB chipsets and HP products.
If you are using a usb hub it could be the problem; try disconnecting the hub. Try to plug the pen drive into a usb port on the pc not on a hub. If the usb hub has a separate power supply make sure it is working. Hope I was of some help, Thanks for using FixYa
I am assuming that there are other USB ports on your notebook that are working and that all of them are occupied. If this is correct, you can purchase a USB hub that will expand a single USB port on your notebook to a larger number of ports. You may need to have a powered hub depending on the devices that you are connecting. USB hubs are not expensive (under $10). Hard drives, CD/DVDs and other power users will probably require a powered hub.
This is not a product recommendation, but an example of what a hub is and how it could help your situation. You can find many other choices by searching for "USB hub".
It is also possible that your USB port has become disabled and needs to be re-enabled through Windows. Look at CONTROL PANEL; SYSTEM; DEVICE MANAGER; UNIVERSAL SERIAL BUS CONTROLLERS. Then examine each one listed to verify that the system thinks they are working correctly. If not, you can take appropriate action from the tabs on that window.
sometimes usb hard drives will not work through a usb hub.
if the drive works connected to the laptop but not the hub then that's how you'll have to use it.
it's also possible the laptop cannot power both the hub AND the drive, in whaich case you'll need a powered hub (one you plug in to the mains).
1st prob. - I appears there is a loose connection problem somewhere - try reseating your RAN and hard disk.
Try to determine which part of the laptop is causing the problem, not moving the laptop around the room but by flexing different parts of the laptop and power cable etc. while it is on your table.
2nd prob -
Some USB devices draw more power than the USB port can provide and you get the error message - "exceeded power limit".
In these cases you will need to purchase a powered USB hub, connect this hub to the laptops USB port and connect the offending USB device into the powered USB hub.
I'm not sure, but I think I understand that you're connecting using a USB hub? If so, try connecting it directly to a USB port. Many times an unpowered USB hub does not supply enough power to run a laser printer. Unhook the printer. Go to Printers and Faxes - delete the printer. Hook up directly to a USB port. Let the computer re-install the printer.
Let me know