Scanners often do not come with a USB cord. If it didn't, are you certain the USB cord is up to snuff - is it USB 2.0 compatible? Most cords that are not labelled or marketed as being USB 2.0 compatible will work with USB 2.0, but not all do - try another USB cord if in doubt. If you had it connected to a hub when you first installed it it might not have installed properly, even if it seemed it had. Try un-installing the scanner, un-installing it's software in Add and Remove programs, then installing it again with it connected only to a directly connected USB port.

0

If you have ever run Windows Setup from scratch on this computer, or if you ever do that in future, you must load the proper chipset drivers including those for USB after Setup has finished so that Windows has the proper information about your mboard. If you have run Windows Setup from scratch and did not load the mboard drivers including those for USB afterwards, your USB 2.0 controllers are probably not being recognized properly and you have only USB 1.x support, which may not be good enough for this scanner - in that case there will be one or more USB controllers in Device Manager that have yellow ! marks beside them. Also make sure all the USB controllers are enabled in your bios Setup.

0

All 8 onboard USB ports appear in Device Manager. The USB cable came with the scanner, so I doubt the cable would be incompatible. After plugging the scanner into an onboard USB port and reinstalling drivers, it had the same problem - would only stay on for a few seconds. Now I have moved it back over to my USB hub and the same problem occured. However, after connecting the USB hub to the mains rather than powering by USB, the scanner now seems to work, but has now made wiring very difficult because I don't actually have enough plugs! So now the scanner works and has power long enough to scan as many images as I like, but I still have a problem: At random times, whether the scanner is in use or not, the USB hub will lose power, cutting power to everything connected to it, including the scanner. windows will then post a "USB Device Not Recognised" message in the corner. Now that the USB hub is connected to the mains, I don't think power is an issue, but you might be able to prove me wrong. Any advice on this? NB: I live in the UK, so standard voltage is 240V, not the international 130V (I think) standard. Immitation is the sincerest form of copyright infringement.

0

Any device that is designed to run on just the USB connection to the computer and on the up to 500ma available from the directly connected to the controller USB ports should work properly. Whether something will work in the USB ports of a powered hub, where 500ma is available to each port, is less certain. You should check the specs of the hub to make sure 500ma is available at each port. There's a small possibilty USB ports that are connected to a mboard header rather than directly to the mboard may be less reliable. I am presently fiddling with a wireless USB network adapter - despite a utility showing it is working 100% whether it is plugged into the former or the latter, it is much more reliable connecting to the internet when connected to a USB port directly connected to the mboard. It doesn't matter what your AC voltage is - the power supply for the computer has a switch for 115/230 accessable outside the computer case at the back of the PS (it would be rare for it to be moved by accident) - as long as that is set to the AC voltage in your area, the voltages from the PS to the computer are identical. However, it is quite possible you have a faulty computer power supply - that is a common problem - and that may be why you are having problems. The USB ports directly connected to the mboard USB controllers may not be actually getting 500ma and close enough to 5v at each port. See response 4 in this to check out your PS: http://www.computing.net/hardware/w... ...... Other things? The USB cord is relatively cheap to buy. You could get another one and try it, or if you have another one already, you could try that. Try the scanner on another computer - if it doesn't work properly on that one either, the scanner may be faulty - a powered USB hub would still have problems if the USB port it connects to that is directly connected to a controller is not getting the proper voltage. Make sure all things that connect to the computer that have grounded AC plugs for their power are connected to grounded outlets or grounded extension cords.

0