USB HUB Cannot be Detected

I have a USB 4 Port HUB 2.0 of which I tried connecting to my Windows 7 64 bit and my Windows Vista Ultimate, but it cannot be detected. It says no driver found. I tried another USB HUB but the same things happens. I went to Device Manager and tried to update the drivers for GENERIC USB HUB and USB ROOT HUB, but it didn't work.

When I attach my external hard disk to the USB HUB, I'm able to see a green light on my External hard disk, but I can't see it on Windows Explorer. If I attach the external hard disk directly to my computer, by-passing the USB 4 Port HUB, then I have no issue reading my external drive.

Could someone please help me get my USB HUB working please?
ben1211Asked:
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nobusConnect With a Mentor Commented:
you go in device manager, click on the + sign left of the usb, and delete or uninstall EVERY entry
then, as said reboot and test
that's all !
if that does not work, post back for more...
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Justin MaloneSystem AdministratorCommented:
have you tried to update the drivers for your motherboard/bios?
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ben1211Author Commented:
Yes I have tried updating the drivers and it says that it has the latest updated drivers. But when I plug in my USB HUB it can't be detected at all. It can't be detected on Windows Vista, as well as Windows 7.
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Ivano ViolaSystem AdministratorCommented:
Is the hub a self-powered hub or does it have it's own power supply? Sometimes the hub itself needs its own power supply eliminating this problem.
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ben1211Author Commented:
This HUB doesn't need a power supply. It worked fine on a different computer, but isn't working on my computer running Windows 7 64 bit.
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Ivano ViolaSystem AdministratorCommented:
O.k...definitely a driver issue. Let me see if I can find anything else to try.
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Ivano ViolaSystem AdministratorCommented:
What is the make/model of your usb hub?
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nobusCommented:
you can try first by deleting all usb entries in device manager, then reboot and test
if it does not work yet, post back !
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nobusCommented:
and just to be sure the hub is ok, test it on another PC !
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ben1211Author Commented:
nobus and ivan,

The make of my USB 4 Port Hub is LEXMA.

I tried this on both my laptops, one using Windows 7 64 bit and the other using Windows Vista Ultimate. Both could not read the USB HUB. I even tried another USB HUB and even that couldn't be read. But I'm 100% certain that there isn't any problem at all with my USB ports. Reason being, when I connect my external HDD to any of my USB ports, it works fine. The problem is only when I connect my External HDD to my USB HUB, it cannot be read.

Nobus, how do I delete all USB entries in device manager and then add it back again?

Secondly, something else you guys should know. I took this USB 4 Port HUB back to the shop I bought it. The tech guy at the shop tried it on his laptop, using Windows Vista, and it worked perfectly. He even attached an external hdd, and a fan to the USB 4 Port HUB and it worked perfectly.

Is there something missing from both my laptops which are running on Windows Vista Ultimate 32 bit and Windows 7 Professional 64 bit?

Please note that both my laptops are connected to a cooling pad, which is connected to the USB port on my laptops and works fine.
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ben1211Author Commented:
hi Nobus....I did exactly as you stated, but it didn't work. When I rebooted my laptop, it installed all the drivers for the USB ports and then, it stated that I needed to re-start the laptop again, but I couldn't read my external HDD which was attached to my USB HUB.
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nobusConnect With a Mentor Commented:
then try these tips :
-from Device manager scan for new hardware
-then you can download the latest drivers for the chipset, and reinstall it to update the USB root hubs
-start>run>diskmgmt.msc      check if the usb devices show up in disk management, then run :   start>run>services.msc
In the listing look for removable storage service.
If it is set to Auto, and not started, then start it : click the Start link in the top left...
-In c:\windows\inf, look for usbstor.inf    -  If it is not there, you can copy it from another PC..When you find it, right click it and select Install
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ben1211Author Commented:
Hi Nobus,

This is my latest finding. I have not done what you have suggested above, due to my latest finding.

My USB 4 Port HUB works, but NOT will all devices. When I connect my External Hard Disk (Buffalo HD-PF250U2 250GB) and my Maxtor 160GB it does not work at all. I did not attach them together at once, but one at a time. But when I add Mouse receiver or my laptop cooling pad to the USB HUB, it works fine. At the shop that I purchased the HUB, the guy there tested the HUB with his External Hard disk (Buffalo Lite), and it worked fine.

My USB HUB doesn't come with a power supply, but there is a small part where it looks like a power supply can be fitted to it. I took my Nokia cell phone charger and attached it to the USB HUB, turned on the power supply, and found that its able to now read my Buffalo and Maxtor External Drive.

My only concern and fear is, would this Nokia cell phone charger (which is not part of the USB HUB), when fitted to the HUB and provides power, would it spoil my Buffalo External Hard Drive?

I find this to be very weird.
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ben1211Author Commented:
By adding this power supply that is used for my Nokia Cell phone charger to provide power for my USB HUB, will this cause problems and spoil my External Hard drives?

Why can't the USB HUB pick up on the two external hard drives?
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nobusConnect With a Mentor Commented:
it probably is NOT the correct power supply for it.
you have to look at the voltage it needs, and the current.
But i agree that is a very possible reason : the USB ports supply only 5V at 0.5 A = 2.5 W, so they can easily be overloaded (check what your disk uses)
what model hub is it??
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ben1211Author Commented:
The brand of the HUB is Lexma.

The brand of the Hard Disk is Buffalo, and it uses USB bus powered DC 5V.
http://www.buffalo-technology.com/products/external-drives/ministation/hd-pfu2-ministation-turbousb/

The link above shows it.

So basically, there's no way for me to really solve this issue, right? I don't have a power supply for my hard disk (or at lease I can't find it).

But my second external hard disk, doesn't have a power supply input. Its a Maxtor 160GB. But even that can't work when its attached to the Lexma USB HUB.
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nobusConnect With a Mentor Commented:
is this it?   they say it has a users guide, look intot that  http://www.lexmausa.com/products/ProductDetail.asp?SwitchFunctionID={C65DAB1C-9A7C-48AB-9295-777F95E2C7C4}&id={15D2D905-E107-4C8B-BF27-E3DD583D973F}&ci=2300

you can always try a POWERED usb hub like this  :  http://www.belkin.com/iwcatproductpage.process?product_id=158910
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ben1211Author Commented:
Nobus, nope...the USB HUB that I have is Lexma UH-UA9 USB 2.0 4. Click on the link below and scroll down till you see the exact same model -  Lexma UH-UA9 USB 2.0 4

http://www.modster-pc.co.nz/shop/index.php?cPath=112

Yes I suppose I can get a powered USB HUB. But I'm not from the US and I hope I can find some good ones like Belkin from where I am. So it seems like my current USB HUB wont be able to support my external hard drives. Looks like I'll have to change my USB HUB :(
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nobusCommented:
is there any marking on the power connector of the hub?
you can also ask them what power it needs :  http://www.lexmausa.com/support/ContactUs.asp
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adamw650Commented:
have you tried to create another user account on your Windows 7 and then login to that account and try your device.  If it works then it will be a profile issue.  
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ben1211Author Commented:
The problem was that the USB HUB required a power supply which did not come with it when I purchased it.
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nobusCommented:
rx for the feedback !
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